diff --git a/AlgebraicDataflowArchitectureModel/src/models/dataConstraintModel/Channel.java b/AlgebraicDataflowArchitectureModel/src/models/dataConstraintModel/Channel.java
index 022644b..2bec47e 100644
--- a/AlgebraicDataflowArchitectureModel/src/models/dataConstraintModel/Channel.java
+++ b/AlgebraicDataflowArchitectureModel/src/models/dataConstraintModel/Channel.java
@@ -85,6 +85,15 @@
 	public void addSelector(Selector selector) {
 		selectors.add(selector);
 	}
+	
+	public List<Expression> getAllSelectorVariables() {
+		List<Expression> allSelectorVariables = new ArrayList<>();
+		if (parent != null) allSelectorVariables.addAll(parent.getAllSelectorVariables());
+		for (Selector sel: selectors) {
+			allSelectorVariables.add(sel.getExpression());
+		}
+		return allSelectorVariables;
+	}
 
 	public Set<ChannelMember> getChannelMembers() {
 		return channelMembers;