diff --git a/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py b/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py
index d20847ef7b9..18c5b105aa8 100755
--- a/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py
+++ b/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py
@@ -63,6 +63,9 @@ from .PostGISExecuteSQL import PostGISExecuteSQL
 from .RandomExtract import RandomExtract
 from .RandomExtractWithinSubsets import RandomExtractWithinSubsets
 from .RegularPoints import RegularPoints
+from .SaveSelectedFeatures import SaveSelectedFeatures
+from .SelectByAttribute import SelectByAttribute
+from .SelectByExpression import SelectByExpression
 from .SimplifyGeometries import SimplifyGeometries
 from .Smooth import Smooth
 from .SpatialiteExecuteSQL import SpatialiteExecuteSQL
@@ -98,7 +101,6 @@ from .VectorSplit import VectorSplit
 # from .SpatialJoin import SpatialJoin
 # from .DeleteDuplicateGeometries import DeleteDuplicateGeometries
 # from .TextToFloat import TextToFloat
-# from .SelectByAttribute import SelectByAttribute
 # from .GridLine import GridLine
 # from .Gridify import Gridify
 # from .HubDistancePoints import HubDistancePoints
@@ -110,7 +112,6 @@ from .VectorSplit import VectorSplit
 # from .StatisticsByCategories import StatisticsByCategories
 # from .EquivalentNumField import EquivalentNumField
 # from .FieldsCalculator import FieldsCalculator
-# from .SaveSelectedFeatures import SaveSelectedFeatures
 # from .Explode import Explode
 # from .FieldPyculator import FieldsPyculator
 # from .JoinAttributes import JoinAttributes
@@ -128,7 +129,6 @@ from .VectorSplit import VectorSplit
 # from .PointsToPaths import PointsToPaths
 # from .SetVectorStyle import SetVectorStyle
 # from .SetRasterStyle import SetRasterStyle
-# from .SelectByExpression import SelectByExpression
 # from .SelectByAttributeSum import SelectByAttributeSum
 # from .HypsometricCurves import HypsometricCurves
 # from .SplitWithLines import SplitWithLines
@@ -202,11 +202,10 @@ class QGISAlgorithmProvider(QgsProcessingProvider):
         #         ExtractByLocation(),
         #         SpatialJoin(),
         #         DeleteDuplicateGeometries(), TextToFloat(),
-        #         SelectByAttribute(),
         #         GridLine(), Gridify(), HubDistancePoints(),
         #         HubDistanceLines(), HubLines(),
         #         GeometryConvert(), FieldsCalculator(),
-        #         SaveSelectedFeatures(), JoinAttributes(),
+        #          JoinAttributes(),
         #         Explode(), FieldsPyculator(),
         #         EquivalentNumField(), PointsLayerFromTable(),
         #         StatisticsByCategories(), ConcaveHull(),
@@ -217,7 +216,7 @@ class QGISAlgorithmProvider(QgsProcessingProvider):
         #         RandomPointsPolygonsVariable(),
         #         RandomPointsAlongLines(), PointsToPaths(),
         #         SetVectorStyle(), SetRasterStyle(),
-        #         SelectByExpression(), HypsometricCurves(),
+        #          HypsometricCurves(),
         #         SplitWithLines(), CreateConstantRaster(),
         #         FieldsMapper(), SelectByAttributeSum(), Datasources2Vrt(),
         #         OrientedMinimumBoundingBox(),
@@ -265,6 +264,9 @@ class QGISAlgorithmProvider(QgsProcessingProvider):
                 RandomExtract(),
                 RandomExtractWithinSubsets(),
                 RegularPoints(),
+                SaveSelectedFeatures(),
+                SelectByAttribute(),
+                SelectByExpression(),
                 SimplifyGeometries(),
                 Smooth(),
                 SpatialiteExecuteSQL(),
diff --git a/python/plugins/processing/algs/qgis/SaveSelectedFeatures.py b/python/plugins/processing/algs/qgis/SaveSelectedFeatures.py
index 3d8e8184276..3abc6a0d05c 100644
--- a/python/plugins/processing/algs/qgis/SaveSelectedFeatures.py
+++ b/python/plugins/processing/algs/qgis/SaveSelectedFeatures.py
@@ -25,30 +25,29 @@ __copyright__ = '(C) 2012, Victor Olaya'
 
 __revision__ = '$Format:%H$'
 
-from qgis.core import (QgsApplication,
-                       QgsFeatureSink,
-                       QgsProcessingUtils)
+from qgis.core import (QgsFeatureSink,
+                       QgsProcessingUtils,
+                       QgsProcessingParameterVectorLayer,
+                       QgsProcessingParameterFeatureSink,
+                       QgsProcessingOutputVectorLayer)
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
 from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
-from processing.core.parameters import ParameterVector
-from processing.core.outputs import OutputVector
 
 
 class SaveSelectedFeatures(QgisAlgorithm):
 
-    OUTPUT_LAYER = 'OUTPUT_LAYER'
-    INPUT_LAYER = 'INPUT_LAYER'
+    OUTPUT = 'OUTPUT'
+    INPUT = 'INPUT'
 
     def group(self):
         return self.tr('Vector general tools')
 
     def __init__(self):
         super().__init__()
-        self.addParameter(ParameterVector(self.INPUT_LAYER,
-                                          self.tr('Input layer')))
 
-        self.addOutput(OutputVector(self.OUTPUT_LAYER,
-                                    self.tr('Selection')))
+        self.addParameter(QgsProcessingParameterVectorLayer(self.INPUT, self.tr('Input layer')))
+        self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Selection')))
+        self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr("Selection")))
 
     def name(self):
         return 'saveselectedfeatures'
@@ -57,20 +56,20 @@ class SaveSelectedFeatures(QgisAlgorithm):
         return self.tr('Save selected features')
 
     def processAlgorithm(self, parameters, context, feedback):
-        inputFilename = self.getParameterValue(self.INPUT_LAYER)
-        output = self.getOutputFromName(self.OUTPUT_LAYER)
+        vectorLayer = self.parameterAsVectorLayer(parameters, self.INPUT, context)
 
-        vectorLayer = QgsProcessingUtils.mapLayerFromString(inputFilename, context)
-
-        writer = output.getVectorWriter(vectorLayer.fields(), vectorLayer.wkbType(), vectorLayer.crs(), context)
+        (sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
+                                               vectorLayer.fields(), vectorLayer.wkbType(), vectorLayer.sourceCrs())
 
         features = vectorLayer.getSelectedFeatures()
         count = int(vectorLayer.selectedFeatureCount())
-        if count == 0:
-            raise GeoAlgorithmExecutionException(self.tr('There are no selected features in the input layer.'))
 
         total = 100.0 / count if count else 1
         for current, feat in enumerate(features):
-            writer.addFeature(feat, QgsFeatureSink.FastInsert)
+            if feedback.isCanceled():
+                break
+
+            sink.addFeature(feat, QgsFeatureSink.FastInsert)
             feedback.setProgress(int(current * total))
-        del writer
+
+        return {self.OUTPUT: dest_id}
diff --git a/python/plugins/processing/algs/qgis/SelectByAttribute.py b/python/plugins/processing/algs/qgis/SelectByAttribute.py
index 94b53a72709..3af9eb908c3 100644
--- a/python/plugins/processing/algs/qgis/SelectByAttribute.py
+++ b/python/plugins/processing/algs/qgis/SelectByAttribute.py
@@ -28,14 +28,14 @@ __revision__ = '$Format:%H$'
 from qgis.core import (QgsApplication)
 from qgis.PyQt.QtCore import QVariant
 from qgis.core import (QgsExpression,
-                       QgsProcessingUtils)
+                       QgsProcessingUtils,
+                       QgsProcessingParameterVectorLayer,
+                       QgsProcessingParameterField,
+                       QgsProcessingParameterEnum,
+                       QgsProcessingParameterString,
+                       QgsProcessingOutputVectorLayer)
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
 from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
-from processing.core.parameters import ParameterVector
-from processing.core.parameters import ParameterTableField
-from processing.core.parameters import ParameterSelection
-from processing.core.parameters import ParameterString
-from processing.core.outputs import OutputVector
 
 
 class SelectByAttribute(QgisAlgorithm):
@@ -82,15 +82,15 @@ class SelectByAttribute(QgisAlgorithm):
                                self.tr('does not contain')
                                ]
 
-        self.addParameter(ParameterVector(self.INPUT,
-                                          self.tr('Input Layer')))
-        self.addParameter(ParameterTableField(self.FIELD,
-                                              self.tr('Selection attribute'), self.INPUT))
-        self.addParameter(ParameterSelection(self.OPERATOR,
-                                             self.tr('Operator'), self.i18n_operators))
-        self.addParameter(ParameterString(self.VALUE, self.tr('Value')))
+        self.addParameter(QgsProcessingParameterVectorLayer(self.INPUT, self.tr('Input layer')))
 
-        self.addOutput(OutputVector(self.OUTPUT, self.tr('Selected (attribute)'), True))
+        self.addParameter(QgsProcessingParameterField(self.FIELD,
+                                                      self.tr('Selection attribute'), parentLayerParameterName=self.INPUT))
+        self.addParameter(QgsProcessingParameterEnum(self.OPERATOR,
+                                                     self.tr('Operator'), self.i18n_operators))
+        self.addParameter(QgsProcessingParameterString(self.VALUE, self.tr('Value')))
+
+        self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Selected (attribute)')))
 
     def name(self):
         return 'selectbyattribute'
@@ -99,11 +99,11 @@ class SelectByAttribute(QgisAlgorithm):
         return self.tr('Select by attribute')
 
     def processAlgorithm(self, parameters, context, feedback):
-        fileName = self.getParameterValue(self.INPUT)
-        layer = QgsProcessingUtils.mapLayerFromString(fileName, context)
-        fieldName = self.getParameterValue(self.FIELD)
-        operator = self.OPERATORS[self.getParameterValue(self.OPERATOR)]
-        value = self.getParameterValue(self.VALUE)
+        layer = self.parameterAsVectorLayer(parameters, self.INPUT, context)
+
+        fieldName = self.parameterAsString(parameters, self.FIELD, context)
+        operator = self.OPERATORS[self.parameterAsEnum(parameters, self.OPERATOR, context)]
+        value = self.parameterAsString(parameters, self.VALUE, context)
 
         fields = layer.fields()
 
@@ -135,4 +135,4 @@ class SelectByAttribute(QgisAlgorithm):
             raise GeoAlgorithmExecutionException(expression.parserErrorString())
 
         layer.selectByExpression(expression_string)
-        self.setOutputValue(self.OUTPUT, fileName)
+        return {self.OUTPUT: parameters[self.INPUT]}
diff --git a/python/plugins/processing/algs/qgis/SelectByExpression.py b/python/plugins/processing/algs/qgis/SelectByExpression.py
index 421753eb80e..ac1f833ab2a 100644
--- a/python/plugins/processing/algs/qgis/SelectByExpression.py
+++ b/python/plugins/processing/algs/qgis/SelectByExpression.py
@@ -24,23 +24,21 @@ __copyright__ = '(C) 2014, Michael Douchin'
 
 __revision__ = '$Format:%H$'
 
-from qgis.core import (QgsApplication,
-                       QgsExpression,
+from qgis.core import (QgsExpression,
                        QgsVectorLayer,
-                       QgsProcessingUtils)
+                       QgsProcessingParameterVectorLayer,
+                       QgsProcessingParameterExpression,
+                       QgsProcessingParameterEnum,
+                       QgsProcessingOutputVectorLayer)
 from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
-from processing.core.parameters import ParameterVector
-from processing.core.parameters import ParameterSelection
-from processing.core.outputs import OutputVector
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
-from processing.core.parameters import ParameterExpression
 
 
 class SelectByExpression(QgisAlgorithm):
 
-    LAYERNAME = 'LAYERNAME'
+    INPUT = 'INPUT'
     EXPRESSION = 'EXPRESSION'
-    RESULT = 'RESULT'
+    OUTPUT = 'OUTPUT'
     METHOD = 'METHOD'
 
     def group(self):
@@ -53,13 +51,14 @@ class SelectByExpression(QgisAlgorithm):
                         self.tr('removing from current selection'),
                         self.tr('selecting within current selection')]
 
-        self.addParameter(ParameterVector(self.LAYERNAME,
-                                          self.tr('Input Layer')))
-        self.addParameter(ParameterExpression(self.EXPRESSION,
-                                              self.tr("Expression"), parent_layer=self.LAYERNAME))
-        self.addParameter(ParameterSelection(self.METHOD,
-                                             self.tr('Modify current selection by'), self.methods, 0))
-        self.addOutput(OutputVector(self.RESULT, self.tr('Selected (expression)'), True))
+        self.addParameter(QgsProcessingParameterVectorLayer(self.INPUT, self.tr('Input layer')))
+
+        self.addParameter(QgsProcessingParameterExpression(self.EXPRESSION,
+                                                           self.tr('Expression'), parentLayerParameterName=self.INPUT))
+        self.addParameter(QgsProcessingParameterEnum(self.METHOD,
+                                                     self.tr('Modify current selection by'), self.methods, 0))
+
+        self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Selected (attribute)')))
 
     def name(self):
         return 'selectbyexpression'
@@ -68,9 +67,9 @@ class SelectByExpression(QgisAlgorithm):
         return self.tr('Select by expression')
 
     def processAlgorithm(self, parameters, context, feedback):
-        filename = self.getParameterValue(self.LAYERNAME)
-        layer = QgsProcessingUtils.mapLayerFromString(filename, context)
-        method = self.getParameterValue(self.METHOD)
+        layer = self.parameterAsVectorLayer(parameters, self.INPUT, context)
+
+        method = self.parameterAsEnum(parameters, self.METHOD, context)
 
         if method == 0:
             behavior = QgsVectorLayer.SetSelection
@@ -81,10 +80,10 @@ class SelectByExpression(QgisAlgorithm):
         elif method == 3:
             behavior = QgsVectorLayer.IntersectSelection
 
-        expression = self.getParameterValue(self.EXPRESSION)
+        expression = self.parameterAsString(parameters, self.EXPRESSION, context)
         qExp = QgsExpression(expression)
         if qExp.hasParserError():
             raise GeoAlgorithmExecutionException(qExp.parserErrorString())
 
         layer.selectByExpression(expression, behavior)
-        self.setOutputValue(self.RESULT, filename)
+        return {self.OUTPUT: parameters[self.INPUT]}
diff --git a/python/plugins/processing/core/Processing.py b/python/plugins/processing/core/Processing.py
index 58c4481ddd6..155f975ccb0 100755
--- a/python/plugins/processing/core/Processing.py
+++ b/python/plugins/processing/core/Processing.py
@@ -39,7 +39,7 @@ from qgis.utils import iface
 from qgis.core import (QgsMessageLog,
                        QgsApplication,
                        QgsProcessingProvider,
-                       QgsProcessingUtils,
+                       QgsProcessingAlgorithm,
                        QgsProcessingParameterDefinition)
 
 import processing
@@ -51,12 +51,13 @@ from processing.gui.RenderingStyles import RenderingStyles
 from processing.gui.Postprocessing import handleAlgorithmResults
 from processing.gui.AlgorithmExecutor import execute
 from processing.tools import dataobjects
+from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
 
 from processing.algs.qgis.QGISAlgorithmProvider import QGISAlgorithmProvider  # NOQA
 #from processing.algs.grass7.Grass7AlgorithmProvider import Grass7AlgorithmProvider  # NOQA
 #from processing.algs.gdal.GdalAlgorithmProvider import GdalAlgorithmProvider  # NOQA
 #from processing.algs.saga.SagaAlgorithmProvider import SagaAlgorithmProvider  # NOQA
-#from processing.script.ScriptAlgorithmProvider import ScriptAlgorithmProvider  # NOQA
+from processing.script.ScriptAlgorithmProvider import ScriptAlgorithmProvider  # NOQA
 #from processing.preconfigured.PreconfiguredAlgorithmProvider import PreconfiguredAlgorithmProvider  # NOQA
 
 # should be loaded last - ensures that all dependent algorithms are available when loading models
@@ -122,128 +123,61 @@ class Processing(object):
         provider.refreshAlgorithms()
 
     @staticmethod
-    def runAlgorithm(algOrName, onFinish, *args, **kwargs):
-        if isinstance(algOrName, GeoAlgorithm):
+    def runAlgorithm(algOrName, parameters, onFinish=None, feedback=None, context=None):
+        if isinstance(algOrName, QgsProcessingAlgorithm):
             alg = algOrName
         else:
             alg = QgsApplication.processingRegistry().algorithmById(algOrName)
+
+        if feedback is None:
+            feedback = MessageBarProgress(alg.displayName() if alg else Processing.tr('Processing'))
+
         if alg is None:
             # fix_print_with_import
             print('Error: Algorithm not found\n')
-            QgsMessageLog.logMessage(Processing.tr('Error: Algorithm {0} not found\n').format(algOrName),
-                                     Processing.tr("Processing"))
-            return
+            msg = Processing.tr('Error: Algorithm {0} not found\n').format(algOrName)
+            feedback.reportError(msg)
+            raise GeoAlgorithmExecutionException(msg)
 
-        parameters = {}
-        if len(args) == 1 and isinstance(args[0], dict):
-            # Set params by name and try to run the alg even if not all parameter values are provided,
-            # by using the default values instead.
-            for (name, value) in list(args[0].items()):
-                param = alg.parameterDefinition(name)
-                if param:
-                    parameters[param.name()] = value
-                    continue
-                # fix_print_with_import
-                print('Error: Wrong parameter value %s for parameter %s.' % (value, name))
-                QgsMessageLog.logMessage(
-                    Processing.tr('Error: Wrong parameter value {0} for parameter {1}.').format(value, name),
-                    Processing.tr("Processing"))
-                QgsMessageLog.logMessage(Processing.tr('Error in {0}. Wrong parameter value {1} for parameter {2}.').format(
-                    alg.name(), value, name
-                ), Processing.tr("Processing"),
-                    QgsMessageLog.CRITICAL
-                )
-                return
-            # check for any manadatory parameters which were not specified
-            for param in alg.parameterDefinitions():
-                if param.name() not in parameters:
-                    if not param.flags() & QgsProcessingParameterDefinition.FlagOptional:
-                        # fix_print_with_import
-                        print('Error: Missing parameter value for parameter %s.' % param.name())
-                        QgsMessageLog.logMessage(
-                            Processing.tr('Error: Missing parameter value for parameter {0}.').format(param.name()),
-                            Processing.tr("Processing"))
-                        return
-        else:
-            if len(args) != alg.countVisibleParameters():
-                # fix_print_with_import
-                print('Error: Wrong number of parameters')
-                QgsMessageLog.logMessage(Processing.tr('Error: Wrong number of parameters'),
-                                         Processing.tr("Processing"))
-                processing.algorithmHelp(algOrName)
-                return
-            i = 0
-            for param in alg.parameterDefinitions():
-                if not param.flags() & QgsProcessingParameterDefinition.FlagHidden:
-                    if not True: # TODO param.setValue(args[i]):
-                        # fix_print_with_import
-                        print('Error: Wrong parameter value: ' + str(args[i]))
-                        QgsMessageLog.logMessage(Processing.tr('Error: Wrong parameter value: ') + str(args[i]),
-                                                 Processing.tr("Processing"))
-                        return
-                    else:
-                        parameters[param.name()] = args[i]
-                    i = i + 1
+        # check for any mandatory parameters which were not specified
+        for param in alg.parameterDefinitions():
+            if param.name() not in parameters:
+                if not param.flags() & QgsProcessingParameterDefinition.FlagOptional:
+                    # fix_print_with_import
+                    msg = Processing.tr('Error: Missing parameter value for parameter {0}.').format(param.name())
+                    print('Error: Missing parameter value for parameter %s.' % param.name())
+                    feedback.reportError(msg)
+                    raise GeoAlgorithmExecutionException(msg)
 
-            for output in alg.outputs:
-                if not output.flags() & QgsProcessingParameterDefinition.FlagHidden:
-                    if not output.setValue(args[i]):
-                        # fix_print_with_import
-                        print('Error: Wrong output value: ' + str(args[i]))
-                        QgsMessageLog.logMessage(Processing.tr('Error: Wrong output value: ') + str(args[i]),
-                                                 Processing.tr("Processing"))
-                        return
-                    i = i + 1
-
-        feedback = None
-        if kwargs is not None and "feedback" in list(kwargs.keys()):
-            feedback = kwargs["feedback"]
-        elif iface is not None:
-            feedback = MessageBarProgress(alg.displayName())
-
-        context = None
-        if kwargs is not None and 'context' in list(kwargs.keys()):
-            context = kwargs["context"]
-        else:
+        if context is None:
             context = dataobjects.createContext(feedback)
 
         ok, msg = alg.checkParameterValues(parameters, context)
         if not ok:
             # fix_print_with_import
             print('Unable to execute algorithm\n' + str(msg))
-            QgsMessageLog.logMessage(Processing.tr('Unable to execute algorithm\n{0}').format(msg),
-                                     Processing.tr("Processing"))
-            return
+            msg = Processing.tr('Unable to execute algorithm\n{0}').format(msg)
+            feedback.reportError(msg)
+            raise GeoAlgorithmExecutionException(msg)
 
         if not alg.validateInputCrs(parameters, context):
             print('Warning: Not all input layers use the same CRS.\n' +
                   'This can cause unexpected results.')
-            QgsMessageLog.logMessage(
-                Processing.tr('Warning: Not all input layers use the same CRS.\nThis can cause unexpected results.'),
-                Processing.tr("Processing"))
-
-        # Don't set the wait cursor twice, because then when you
-        # restore it, it will still be a wait cursor.
-        overrideCursor = False
-        if iface is not None:
-            cursor = QApplication.overrideCursor()
-            if cursor is None or cursor == 0:
-                QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
-                overrideCursor = True
-            elif cursor.shape() != Qt.WaitCursor:
-                QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
-                overrideCursor = True
+            feedback.pushInfo(
+                Processing.tr('Warning: Not all input layers use the same CRS.\nThis can cause unexpected results.'))
 
         ret, results = execute(alg, parameters, context, feedback)
         if ret:
+            feedback.pushInfo(
+                Processing.tr('Results: {}').format(results))
+
             if onFinish is not None:
                 onFinish(alg, context, feedback)
         else:
-            QgsMessageLog.logMessage(Processing.tr("There were errors executing the algorithm."),
-                                     Processing.tr("Processing"))
+            msg = Processing.tr("There were errors executing the algorithm.")
+            feedback.reportError(msg)
+            raise GeoAlgorithmExecutionException(msg)
 
-        if overrideCursor:
-            QApplication.restoreOverrideCursor()
         if isinstance(feedback, MessageBarProgress):
             feedback.close()
         return results
diff --git a/python/plugins/processing/gui/AlgorithmDialog.py b/python/plugins/processing/gui/AlgorithmDialog.py
index bd2f2f1a97d..4220ea3b846 100644
--- a/python/plugins/processing/gui/AlgorithmDialog.py
+++ b/python/plugins/processing/gui/AlgorithmDialog.py
@@ -39,6 +39,8 @@ from qgis.core import (QgsProject,
                        QgsProcessingParameterDefinition,
                        QgsProcessingOutputRasterLayer,
                        QgsProcessingOutputVectorLayer,
+                       QgsProcessingOutputHtml,
+                       QgsProcessingParameterVectorOutput,
                        QgsProcessingOutputLayerDefinition,
                        QgsProcessingParameterFeatureSink,
                        QgsProcessingParameterRasterOutput,
@@ -48,7 +50,7 @@ from qgis.utils import iface
 
 from processing.core.ProcessingLog import ProcessingLog
 from processing.core.ProcessingConfig import ProcessingConfig
-
+from processing.core.ProcessingResults import resultsList
 from processing.gui.ParametersPanel import ParametersPanel
 from processing.gui.BatchAlgorithmDialog import BatchAlgorithmDialog
 from processing.gui.AlgorithmDialogBase import AlgorithmDialogBase
@@ -82,7 +84,6 @@ class AlgorithmDialog(AlgorithmDialogBase):
         self.cornerWidget = QWidget()
         layout = QVBoxLayout()
         layout.setContentsMargins(0, 0, 0, 5)
-        self.tabWidget.setStyleSheet("QTabBar::tab { height: 30px; }")
         self.runAsBatchButton = QPushButton(self.tr("Run as batch process..."))
         self.runAsBatchButton.clicked.connect(self.runAsBatch)
         layout.addWidget(self.runAsBatchButton)
@@ -116,7 +117,7 @@ class AlgorithmDialog(AlgorithmDialogBase):
             else:
                 dest_project = None
                 if not param.flags() & QgsProcessingParameterDefinition.FlagHidden and \
-                        isinstance(param, (QgsProcessingParameterRasterOutput, QgsProcessingParameterFeatureSink, OutputTable)):
+                        isinstance(param, (QgsProcessingParameterRasterOutput, QgsProcessingParameterFeatureSink, QgsProcessingParameterVectorOutput)):
                     if self.mainWidget.checkBoxes[param.name()].isChecked():
                         dest_project = QgsProject.instance()
 
@@ -273,6 +274,12 @@ class AlgorithmDialog(AlgorithmDialogBase):
 
         if self.iterateParam is None:
 
+            # add html results to results dock
+            for out in self.alg.outputDefinitions():
+                if isinstance(out, QgsProcessingOutputHtml) and out.name() in result and result[out.name()]:
+                    resultsList.addResult(icon=self.alg.icon(), name=out.description(),
+                                          result=result[out.name()])
+
             if not handleAlgorithmResults(self.alg, context, feedback, not keepOpen):
                 self.resetGUI()
                 return
diff --git a/python/plugins/processing/gui/DestinationSelectionPanel.py b/python/plugins/processing/gui/DestinationSelectionPanel.py
index 13e9827b1da..7dfa558f0fb 100644
--- a/python/plugins/processing/gui/DestinationSelectionPanel.py
+++ b/python/plugins/processing/gui/DestinationSelectionPanel.py
@@ -267,6 +267,8 @@ class DestinationSelectionPanel(BASE, WIDGET):
         key = None
         if self.use_temporary and isinstance(self.parameter, QgsProcessingParameterFeatureSink):
             key = 'memory:'
+        elif self.use_temporary:
+            key = self.parameter.generateTemporaryDestination()
         else:
             key = self.leText.text()
 
diff --git a/python/plugins/processing/gui/wrappers.py b/python/plugins/processing/gui/wrappers.py
index 0d8bf4ab5e2..d3194f6161a 100644
--- a/python/plugins/processing/gui/wrappers.py
+++ b/python/plugins/processing/gui/wrappers.py
@@ -1077,16 +1077,12 @@ class TableWidgetWrapper(WidgetWrapper):
             return BatchInputSelectionPanel(self.param, self.row, self.col, self.dialog)
         else:
             self.combo = QComboBox()
-            layers = self.dialog.getAvailableValuesOfType(QgsProcessingParameterRasterLayer, QgsProcessingOutputRasterLayer)
             self.combo.setEditable(True)
-            tables = self.dialog.getAvailableValuesOfType(QgsProcessingParameterVectorLayer, OutputTable)
-            layers = self.dialog.getAvailableValuesOfType(QgsProcessingParameterFeatureSource, QgsProcessingOutputVectorLayer)
+            tables = self.dialog.getAvailableValuesOfType(QgsProcessingParameterVectorLayer, QgsProcessingOutputVectorLayer)
             if self.param.flags() & QgsProcessingParameterDefinition.FlagOptional:
                 self.combo.addItem(self.NOT_SELECTED, None)
             for table in tables:
                 self.combo.addItem(self.dialog.resolveValueDescription(table), table)
-            for layer in layers:
-                self.combo.addItem(self.dialog.resolveValueDescription(layer), layer)
 
             widget = QWidget()
             layout = QHBoxLayout()
diff --git a/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml b/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
index 657b24db719..d77503b5003 100644
--- a/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
+++ b/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
@@ -2543,29 +2543,29 @@ tests:
 #      MIN_DISTANCE: 0.0
 #      POINT_NUMBER: 5
 #    results: {}
-#
-#  - algorithm: script:selectbyattribute
-#    name: Select by attribute
-#    params:
-#      INPUT_LAYER:
-#        name: points.gml
-#        type: vector
-#    results:
-#      OUTPUT_LAYER:
-#        name: expected/selected_points.gml
-#        type: vector
-#
-#  - algorithm: script:selectbyexpression
-#    name: Select by expression
-#    params:
-#      INPUT_LAYER:
-#        name: points.gml
-#        type: vector
-#    results:
-#      OUTPUT_LAYER:
-#        name: expected/select_by_expression.gml
-#        type: vector
-#
+
+  - algorithm: script:selectbyattribute
+    name: Select by attribute
+    params:
+      INPUT_LAYER:
+        name: points.gml
+        type: vector
+    results:
+      OUTPUT_LAYER:
+        name: expected/selected_points.gml
+        type: vector
+
+  - algorithm: script:selectbyexpression
+    name: Select by expression
+    params:
+      INPUT_LAYER:
+        name: points.gml
+        type: vector
+    results:
+      OUTPUT_LAYER:
+        name: expected/select_by_expression.gml
+        type: vector
+
   - algorithm: qgis:randomextract
     name: Random extract by number
     params:
diff --git a/python/plugins/processing/tests/testdata/script_algorithm_tests.yaml b/python/plugins/processing/tests/testdata/script_algorithm_tests.yaml
index 6ff51fe7fc5..1d417a17dc5 100644
--- a/python/plugins/processing/tests/testdata/script_algorithm_tests.yaml
+++ b/python/plugins/processing/tests/testdata/script_algorithm_tests.yaml
@@ -2,16 +2,16 @@
 
 tests:
 
-#  - algorithm: script:centroids
-#    name: Centroids script test
-#    params:
-#      INPUT_LAYER:
-#        name: polys.gml
-#        type: vector
-#    results:
-#      OUTPUT_LAYER:
-#        name: expected/centroid_polys.gml
-#        type: vector
-#        compare:
-#          geometry:
-#            precision: 7
+  - algorithm: script:centroids
+    name: Centroids script test
+    params:
+      INPUT_LAYER:
+        name: polys.gml
+        type: vector
+    results:
+      OUTPUT_LAYER:
+        name: expected/centroid_polys.gml
+        type: vector
+        compare:
+          geometry:
+            precision: 7
diff --git a/python/plugins/processing/tests/testdata/scripts/centroids.py b/python/plugins/processing/tests/testdata/scripts/centroids.py
index 70b76dedb45..a8dc13be9e7 100644
--- a/python/plugins/processing/tests/testdata/scripts/centroids.py
+++ b/python/plugins/processing/tests/testdata/scripts/centroids.py
@@ -1,17 +1,24 @@
 ##Centroids=name
 ##Geometry=group
-##INPUT_LAYER=vector
-##OUTPUT_LAYER=output vector
+
+#inputs
+
+##INPUT_LAYER=source
+##OUTPUT_LAYER=sink point
+
+#outputs
+
+##OUTPUT_LAYER=output outputVector
 
 from qgis.core import QgsWkbTypes, QgsProcessingUtils
 
-layer = QgsProcessingUtils.mapLayerFromString(INPUT_LAYER, context)
-fields = layer.fields()
+fields = INPUT_LAYER.fields()
 
-writer, writer_dest = QgsProcessingUtils.createFeatureSink(OUTPUT_LAYER, context, fields, QgsWkbTypes.Point, layer.crs(), {'fileEncoding': 'utf-8'})
+(sink, OUTPUT_LAYER) = self.parameterAsSink(parameters, 'OUTPUT_LAYER', context,
+                                            fields, QgsWkbTypes.Point, INPUT_LAYER.sourceCrs())
 
-features = QgsProcessingUtils.getFeatures(layer, context)
-count = QgsProcessingUtils.featureCount(layer, context)
+features = INPUT_LAYER.getFeatures()
+count = INPUT_LAYER.featureCount()
 if count == 0:
     raise GeoAlgorithmExecutionException('Input layer contains no features.')
 
@@ -23,5 +30,5 @@ for count, f in enumerate(features):
         outputGeometry = f.geometry().centroid()
         outputFeature.setGeometry(outputGeometry)
 
-    writer.addFeature(outputFeature)
+    sink.addFeature(outputFeature)
     feedback.setProgress(int(count * total))
diff --git a/python/plugins/processing/tests/testdata/scripts/selectbyattribute.py b/python/plugins/processing/tests/testdata/scripts/selectbyattribute.py
index be8c70d1213..28f0250a07c 100644
--- a/python/plugins/processing/tests/testdata/scripts/selectbyattribute.py
+++ b/python/plugins/processing/tests/testdata/scripts/selectbyattribute.py
@@ -1,16 +1,23 @@
 ##Select by attribute=name
 ##Tests=group
+
+#inputs
+
 ##INPUT_LAYER=vector
-##OUTPUT_LAYER=output vector
+##OUTPUT_LAYER=vectorOut
+
+#outputs
+
+##OUTPUT_LAYER=output outputVector
 
 import processing
 
 result = processing.run("qgis:selectbyattribute",
-                        INPUT_LAYER,
-                        "id2",
-                        0,
-                        "2")
-
-processing.run("qgis:saveselectedfeatures",
-               result["OUTPUT"],
-               OUTPUT_LAYER)
+                        {'INPUT': INPUT_LAYER,
+                         'FIELD': "id2",
+                         'OPERATOR': 0,
+                         'VALUE': "2"}, context=context, feedback=feedback)
+result = processing.run("qgis:saveselectedfeatures",
+                        {'INPUT': result["OUTPUT"],
+                         'OUTPUT': parameters['OUTPUT_LAYER']}, context=context, feedback=feedback)
+OUTPUT_LAYER = result['OUTPUT']
diff --git a/python/plugins/processing/tests/testdata/scripts/selectbyexpression.py b/python/plugins/processing/tests/testdata/scripts/selectbyexpression.py
index c45b5d1768d..25e693b9242 100644
--- a/python/plugins/processing/tests/testdata/scripts/selectbyexpression.py
+++ b/python/plugins/processing/tests/testdata/scripts/selectbyexpression.py
@@ -1,15 +1,25 @@
 ##Select by expression=name
 ##Tests=group
+
+#inputs
+
 ##INPUT_LAYER=vector
-##OUTPUT_LAYER=output vector
+##OUTPUT_LAYER=vectorOut
+
+#outputs
+
+##OUTPUT_LAYER=output outputVector
+
 
 import processing
 
 result = processing.run("qgis:selectbyexpression",
-                        INPUT_LAYER,
-                        '"id2" = 0 and "id" > 7',
-                        "1")
+                        {'INPUT': INPUT_LAYER,
+                         'EXPRESSION': '"id2" = 0 and "id" > 7',
+                         'METHOD': 1}, context=context, feedback=feedback)
 
-processing.run("qgis:saveselectedfeatures",
-               result["RESULT"],
-               OUTPUT_LAYER)
+result = processing.run("qgis:saveselectedfeatures",
+                        {'INPUT': result["OUTPUT"],
+                         'OUTPUT': parameters['OUTPUT_LAYER']},
+                        context=context, feedback=feedback)
+OUTPUT_LAYER = result['OUTPUT']
diff --git a/python/plugins/processing/tools/general.py b/python/plugins/processing/tools/general.py
index 323b515e59c..aa18f23ac56 100644
--- a/python/plugins/processing/tools/general.py
+++ b/python/plugins/processing/tools/general.py
@@ -69,11 +69,11 @@ def algorithmHelp(id):
         print('Algorithm "{}" not found.'.format(id))
 
 
-def run(algOrName, *args, **kwargs):
+def run(algOrName, parameters, onFinish=None, feedback=None, context=None):
     """Executes given algorithm and returns its outputs as dictionary
     object.
     """
-    return Processing.runAlgorithm(algOrName, None, *args, **kwargs)
+    return Processing.runAlgorithm(algOrName, parameters, onFinish, feedback, context)
 
 
 def runAndLoadResults(name, *args, **kwargs):
diff --git a/src/core/processing/qgsprocessingutils.cpp b/src/core/processing/qgsprocessingutils.cpp
index c3d9c1ce8e6..ded185b973d 100644
--- a/src/core/processing/qgsprocessingutils.cpp
+++ b/src/core/processing/qgsprocessingutils.cpp
@@ -408,7 +408,7 @@ QString QgsProcessingUtils::tempFolder()
   sMutex.lock();
   if ( sFolder.isEmpty() )
   {
-    QString subPath = QUuid::createUuid().toString();
+    QString subPath = QUuid::createUuid().toString().remove( '-' ).remove( '{' ).remove( '}' );
     sFolder = QDir::tempPath() + QStringLiteral( "/processing_" ) + subPath;
     if ( !QDir( sFolder ).exists() )
       QDir().mkpath( sFolder );
@@ -419,12 +419,12 @@ QString QgsProcessingUtils::tempFolder()
 
 QString QgsProcessingUtils::generateTempFilename( const QString &basename )
 {
-  QString subPath = QUuid::createUuid().toString();
+  QString subPath = QUuid::createUuid().toString().remove( '-' ).remove( '{' ).remove( '}' );
   QString path = tempFolder() + '/' + subPath;
   if ( !QDir( path ).exists() ) //make sure the directory exists - it shouldn't, but lets be safe...
   {
-    QDir tmpDir( QDir::tempPath() );
-    tmpDir.mkdir( subPath );
+    QDir tmpDir;
+    tmpDir.mkdir( path );
   }
   return path + '/' + basename;
 }