diff --git a/introduction/introduction.tex b/introduction/introduction.tex
index 14a0e18..6e98742 100644
--- a/introduction/introduction.tex
+++ b/introduction/introduction.tex
@@ -25,7 +25,7 @@
 
 \paragraph{Scope of thesis}
 This thesis describes the application of, a common notation mathematical notation to
-describe the design of safety critical systems/PEC's. 
+describe the design of safety critical systems/PEC's from the perspective of failure modes. 
 The initial motivation for this study was to create a system
 applicable to industrial burner controllers\footnote{Burner Controllers cover the disiplines of
 combustion, high pressure steam and hot water, mechanical control, electronics and embedded software.}.