diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildDescription.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildDescription.java
index 99507491d68..e43a9f3f897 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildDescription.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildDescription.java
@@ -23,16 +23,16 @@ import org.eclipse.core.runtime.IPath;
 public interface IBuildDescription {
 	
 	/**
-	 * Returns the main input action
+	 * Returns the main input step
 	 * 
-	 * @return IBuildAction
+	 * @return IBuildStep
 	 */
 	IBuildStep getInputStep();
 	
 	/**
-	 * Returns the main output action
+	 * Returns the main output step
 	 * 
-	 * @return IBuildAction
+	 * @return IBuildStep
 	 */
 	IBuildStep getOutputStep();
 
diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildIOType.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildIOType.java
index 35cbc144719..ddf7a2d76fc 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildIOType.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildIOType.java
@@ -19,7 +19,7 @@ package org.eclipse.cdt.managedbuilder.buildmodel;
  */
 public interface IBuildIOType {
 	/**
-	 * Specifies whether this argument is Action input or output
+	 * Specifies whether this argument is Step input or output
 	 * 
 	 * @return boolean
 	 */
@@ -33,9 +33,9 @@ public interface IBuildIOType {
 	IBuildResource[] getResources();
 	
 	/**
-	 * Specifies the build action this argument belongs to
+	 * Specifies the build step this argument belongs to
 	 * 
-	 * @return IBuildAction
+	 * @return IBuildStep
 	 */
 	IBuildStep getStep();
 }
diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildResource.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildResource.java
index c88ed1623d2..6b727b35bc3 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildResource.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildResource.java
@@ -26,34 +26,55 @@ public interface IBuildResource {
 	IPath getLocation();
 	
 	/**
-	 * Returns the resource path related to the project directory
-	 * or an absolute path(location) in case the resource 
-	 * is located outside the project directory
+	 * In case the resource is a workspace resource,
+	 * returns the full workspace path for the resource
+	 * otherwise returns null
 	 * 
 	 * @return IPath
 	 */
 	IPath getFullPath();
 	
 	/**
-	 * Returns the output argument of the action
-	 * That generates this resource.
+	 * Returns the output io type of the step
+	 * that generates this resource.
 	 * In case the resource is the project source,
-	 * The main input action is returned
-	 * @see IBuildRepresentation.getInputAction()
+	 * The returned output io type belongs to the main input step
 	 * 
-	 * @return IBuildArgument
+	 * @see IBuildRepresentation.getInputStep()
+	 * 
+	 * @return IBuildIOType
 	 */
 	IBuildIOType getProducerIOType();
 	
 	/**
-	 * Returns an array of arguments where this resource is used as an input
+	 * Returns an array of io types where this resource is used as an input
 	 * 
-	 * @return IBuildArgument[]
+	 * @return IBuildIOType[]
 	 */
 	IBuildIOType[] getDependentIOTypes();
 	
+	/**
+	 * Returns the step that generates this resource.
+	 * In case the resource is the project source,
+	 * The main input step is returned
+	 * 
+	 * @see IBuildRepresentation.getInputStep()
+	 * 
+	 * @return IBuildIOType
+	 */
+	IBuildStep getProducerStep();
+
+	/**
+	 * Returns an array of steps that use this resource as an input
+	 * 
+	 * @return IBuildIOType[]
+	 */
+	IBuildStep[] getDependentSteps();
+
 	/**
 	 * Returns true if the resource needs rebuild
+	 * this implies that all build steps dependent on this resource
+	 * are to be invoked
 	 * 
 	 * @return boolean
 	 */
diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildStep.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildStep.java
index 63cd2c0f90b..07440b842cf 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildStep.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IBuildStep.java
@@ -22,7 +22,7 @@ import org.eclipse.core.runtime.IPath;
  */
 public interface IBuildStep {
 	/**
-	 * Returns an array of input arguments for this action
+	 * Returns an array of input types for this step
 	 * @see IBuildIOType
 	 * 
 	 * @return IBuildIOType[]
@@ -30,7 +30,7 @@ public interface IBuildStep {
 	IBuildIOType[] getInputIOTypes();
 	
 	/**
-	 * Returns an array of input arguments for this action
+	 * Returns an array of output types for this step
 	 * @see IBuildIOType
 	 * 
 	 * @return IBuildIOType[]
@@ -38,28 +38,28 @@ public interface IBuildStep {
 	IBuildIOType[] getOutputIOTypes();
 
 	/**
-	 * Returns true if the action needs rebuild, false - otherwise
+	 * Returns true if the step needs rebuild, false - otherwise
 	 * 
 	 * @return boolean
 	 */
 	boolean needsRebuild();
 	
 	/**
-	 * Returns the complete set of input resources for this action
+	 * Returns the complete set of input resources for this step
 	 * 
 	 * @return IBuildResource[]
 	 */
 	IBuildResource[] getInputResources();
 
 	/**
-	 * Returns the complete set of output resources for this action
+	 * Returns the complete set of output resources for this step
 	 * 
 	 * @return IBuildResource[]
 	 */
 	IBuildResource[] getOutputResources();
 	
 	/**
-	 * Returns true if the action is removed (due to removal 
+	 * Returns true if the step is removed (due to removal 
 	 * of the project resources that were ised in thie action)
 	 * 
 	 * @return boolean
diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IStepVisitor.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IStepVisitor.java
index 08ebee65dbe..5c357a2e4ff 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IStepVisitor.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/buildmodel/IStepVisitor.java
@@ -21,17 +21,29 @@ import org.eclipse.core.runtime.CoreException;
  *
  */
 public interface IStepVisitor {
+	/**
+	 * This constant can is returneed by the step visitor
+	 * to tell the visitor mechanism to continue step visiting process
+	 */
 	public static final int VISIT_CONTINUE = 1;
+	
+	/**
+	 * This constant can is returneed by the step visitor
+	 * to tell the visitor mechanism to stop step visiting process
+	 */
 	public static final int VISIT_STOP = 2;
 	
 	/**
 	 * this call-back method is called by the build description
 	 * visitor mechanism for each step in the build description
+	 * The method should return one of the IStepVisitor.VISIT_xxx constants
 	 * 
+	 * @see IStepVisitor#VISIT_CONTINUE
+	 * @see IStepVisitor#VISIT_STOP
 	 * @see BuildDescriptionManager#accept(IStepVisitor, IBuildDescription, boolean)
 	 * 
 	 * @param step
-	 * @return
+	 * @return int
 	 * @throws CoreException
 	 */
 	int visit(IBuildStep step) throws CoreException;
diff --git a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/buildmodel/BuildResource.java b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/buildmodel/BuildResource.java
index 904808315a5..d73956dbf90 100644
--- a/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/buildmodel/BuildResource.java
+++ b/build/org.eclipse.cdt.managedbuilder.core/src/org/eclipse/cdt/managedbuilder/internal/buildmodel/BuildResource.java
@@ -11,11 +11,15 @@
 package org.eclipse.cdt.managedbuilder.internal.buildmodel;
 
 import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Iterator;
 import java.util.List;
+import java.util.Set;
 
 import org.eclipse.cdt.managedbuilder.buildmodel.IBuildDescription;
 import org.eclipse.cdt.managedbuilder.buildmodel.IBuildIOType;
 import org.eclipse.cdt.managedbuilder.buildmodel.IBuildResource;
+import org.eclipse.cdt.managedbuilder.buildmodel.IBuildStep;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.runtime.IPath;
 
@@ -165,4 +169,18 @@ public class BuildResource implements IBuildResource {
 		return fInfo;
 	}
 
+	public IBuildStep[] getDependentSteps() {
+		Set set = new HashSet();
+		for(Iterator iter = fDepArgs.iterator(); iter.hasNext();){
+			set.add(((BuildIOType)iter.next()).getStep());
+		}
+		return (BuildStep[])set.toArray(new BuildStep[set.size()]);
+	}
+
+	public IBuildStep getProducerStep() {
+		if(fProducerArg != null)
+			return fProducerArg.getStep();
+		return null;
+	}
+
 }