diff --git a/src/main/java/org/gcube/common/workspacetaskexecutor/dataminer/WorkspaceDataMinerTaskExecutor.java b/src/main/java/org/gcube/common/workspacetaskexecutor/dataminer/WorkspaceDataMinerTaskExecutor.java
index b1553b7..d56a3cc 100644
--- a/src/main/java/org/gcube/common/workspacetaskexecutor/dataminer/WorkspaceDataMinerTaskExecutor.java
+++ b/src/main/java/org/gcube/common/workspacetaskexecutor/dataminer/WorkspaceDataMinerTaskExecutor.java
@@ -8,6 +8,7 @@ import org.gcube.common.homelibrary.home.exceptions.InternalErrorException;
 import org.gcube.common.homelibrary.home.workspace.WorkspaceItem;
 import org.gcube.common.workspacetaskexecutor.shared.ExecutableItem;
 import org.gcube.common.workspacetaskexecutor.shared.ExecutableTask;
+import org.gcube.common.workspacetaskexecutor.shared.FilterOperator;
 import org.gcube.common.workspacetaskexecutor.shared.TaskOperator;
 import org.gcube.common.workspacetaskexecutor.shared.TaskOutput;
 import org.gcube.common.workspacetaskexecutor.shared.TaskParameter;
@@ -443,10 +444,13 @@ public class WorkspaceDataMinerTaskExecutor implements ExecutableTask<TaskConfig
 	 * Gets the list operators.
 	 *
 	 * @param filterForParameterNames the filter for parameter names. It returns only {@link TaskOperator} matching the input filters
+	 * @param operator the operator applied to the filters. It must be of type {@link FilterOperator}
 	 * @return the list operators
 	 * @throws Exception the exception
 	 */
-	public List<TaskOperator> getListOperators(String[] filterForParameterNames) throws Exception{
+	public List<TaskOperator> getListOperators(String[] filterForParameterNames, FilterOperator operator) throws Exception{
+
+		Validate.notNull(operator, "The "+FilterOperator.class.getSimpleName()+" passed is null");
 
 		DataMinerAccessPoint dap = getDataMinerAccessPoint();
 
@@ -455,29 +459,35 @@ public class WorkspaceDataMinerTaskExecutor implements ExecutableTask<TaskConfig
 			return dap.getListOperators();
 		}
 
+		List<TaskOperator> filteredListOperators = new ArrayList<TaskOperator>(dap.getListOperators().size());
+
 		//APPLYING FILTERS ON PARAMETER NAME/TYPE
 		for (TaskOperator taskOperator : dap.getListOperators()) {
 			logger.trace("***Algor: "+taskOperator.getName());
 			List<TaskParameter> io = taskOperator.getInputOperators();
-			boolean filterPassed = false;
+			int filterPassed = 0;
+
 			for (TaskParameter taskParameter : io) {
 				logger.trace("key: "+taskParameter.getKey() + ", value: "+taskParameter.getValue() +", defaultValue: "+taskParameter.getDefaultValue());
 				for (String filterParameterName : filterForParameterNames) {
 					if(taskParameter.getKey().compareToIgnoreCase(filterParameterName)==0){
-						filterPassed = true;
-						break;
+						filterPassed++;
 					}
 				}
-
-				if(!filterPassed){
-					logger.info("Removed key: "+taskParameter.getKey() + " It does not match filters: "+filterForParameterNames);
-					io.remove(taskParameter);
-				}
 			}
 
+			if(operator.equals(FilterOperator.LOGICAL_OR) && filterPassed>=1){
+				filteredListOperators.add(taskOperator);
+			//IN AND ALL FILTERS MUST BE MATCHED
+			}else if(operator.equals(FilterOperator.LOGICAL_AND) && filterPassed==filterForParameterNames.length){
+				filteredListOperators.add(taskOperator);
+			}
+			else
+				logger.info("Removed operator: "+taskOperator + " It does not match filters: "+filterForParameterNames);
+
 		}
 
-		return dap.getListOperators();
+		return filteredListOperators;
 	}
 
 
diff --git a/src/main/java/org/gcube/common/workspacetaskexecutor/shared/FilterOperator.java b/src/main/java/org/gcube/common/workspacetaskexecutor/shared/FilterOperator.java
new file mode 100644
index 0000000..788c1ab
--- /dev/null
+++ b/src/main/java/org/gcube/common/workspacetaskexecutor/shared/FilterOperator.java
@@ -0,0 +1,19 @@
+/**
+ *
+ */
+package org.gcube.common.workspacetaskexecutor.shared;
+
+import java.io.Serializable;
+
+
+/**
+ * The Enum FilterOperator.
+ *
+ * @author Francesco Mangiacrapa at ISTI-CNR (francesco.mangiacrapa@isti.cnr.it)
+ * Jun 12, 2018
+ */
+public enum FilterOperator implements Serializable{
+
+	LOGICAL_OR,
+	LOGICAL_AND;
+}