diff --git a/MOT Capture Process Simulation/@MOTSimulator/computeCollisionProbability.m b/MOT Capture Process Simulation/@MOTSimulator/computeCollisionProbability.m
new file mode 100644
index 0000000..7b34fe7
--- /dev/null
+++ b/MOT Capture Process Simulation/@MOTSimulator/computeCollisionProbability.m	
@@ -0,0 +1,9 @@
+function ret = computeCollisionProbability(this)
+    collision            = rand(1);
+    CollisionProbability = 1 - exp(-this.TimeSpentInInteractionRegion/this.CollisionTime);
+    if this.BackgroundCollision && collision <= CollisionProbability  
+        ret = true;
+    else
+        ret = false;
+    end
+end
\ No newline at end of file