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diff --git a/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/chr/planning/PrePlanItem.java b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/chr/planning/PrePlanItem.java
new file mode 100644
index 000000000..bb8590020
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/chr/planning/PrePlanItem.java
@@ -0,0 +1,31 @@
+package org.simantics.scl.compiler.elaboration.chr.planning;
+
+public abstract class PrePlanItem {
+    int queuePos;
+    /* Primary priorities:
+     *     0 = check
+     *     1 = functional calculation
+     *     2 = almost completely bound relation
+     *     3 = completely inbound relation
+     */
+    public double primaryPriority = Double.POSITIVE_INFINITY;
+    public int secondaryPriority;
+    public long location;
+        
+    public PrePlanItem(int secondaryPriority) {
+        this.secondaryPriority = secondaryPriority;
+    }
+
+    public int compare(PrePlanItem other) {
+        if(primaryPriority < other.primaryPriority)
+            return -1;
+        if(primaryPriority > other.primaryPriority)
+            return 1;
+        return Integer.compare(secondaryPriority, other.secondaryPriority);    
+    }
+
+    public abstract void initializeListeners(QueryPlanningContext context);
+    public abstract void variableSolved(QueryPlanningContext context, int variableId);
+
+    public abstract void generate(QueryPlanningContext context);
+}