diff --git a/src/Kendrick-Core/K2TGillespieSimulation.trait.st b/src/Kendrick-Core/K2TGillespieSimulation.trait.st
new file mode 100644
index 00000000..5f3231a6
--- /dev/null
+++ b/src/Kendrick-Core/K2TGillespieSimulation.trait.st
@@ -0,0 +1,25 @@
+"
+Add a trait for Gillespie simulation engine. Models that are simulable by Gillespie engine should use this trait.
+"
+Trait {
+	#name : #K2TGillespieSimulation,
+	#category : #'Kendrick-Core'
+}
+
+{ #category : #accessing }
+K2TGillespieSimulation >> executeEventAtRateIndex: aNumber [
+
+	self explicitRequirement
+]
+
+{ #category : #accessing }
+K2TGillespieSimulation >> rates [
+
+	self explicitRequirement
+]
+
+{ #category : #accessing }
+K2TGillespieSimulation >> t: time [
+
+	self explicitRequirement 
+]