diff --git a/invopamp/invopamp.tex b/invopamp/invopamp.tex
index e17642e..cef93a2 100644
--- a/invopamp/invopamp.tex
+++ b/invopamp/invopamp.tex
@@ -585,13 +585,13 @@ For this amplifier configuration we have three failure modes, $AMPHigh, AMPLow,
 \ifthenelse {\boolean{pld}}
 {
 We can now derive a `component' to represent this amplifier configuration (see figure ~\ref{fig:noninvampa}).
-\begin{figure}[h+]
- \centering
- \includegraphics[width=200pt,keepaspectratio=true]{./invopamp/noninvampa.png}
- % noninvampa.jpg: 436x720 pixel, 72dpi, 15.38x25.40 cm, bb=0 0 436 720
- \caption{Non Inverting Amplifier Derived Component}
- \label{fig:noninvampa}
-\end{figure}
+%\begin{figure}[h+]
+% \centering
+% \includegraphics[width=200pt,keepaspectratio=true]{./invopamp/noninvampa.png}
+% % noninvampa.jpg: 436x720 pixel, 72dpi, 15.38x25.40 cm, bb=0 0 436 720
+% \caption{Non Inverting Amplifier Derived Component}
+% \label{fig:noninvampa}
+%\end{figure}
 }
 {
 }
diff --git a/noninvopamp/noninvopamp.tex b/noninvopamp/noninvopamp.tex
index 5b5d371..2a77ba0 100644
--- a/noninvopamp/noninvopamp.tex
+++ b/noninvopamp/noninvopamp.tex
@@ -723,6 +723,13 @@ to assist in building models for FTA, FMEA, FMECA and FMEDA failure mode analysi
 
 
 
+\section{Deriving FTA, FMEA, FMECA and FMEDA models from the DAG}
+
+The example here is very low level, or in other words is a very sysple sub-system.
+The FTA, FMEA, FMECA and FMEDA would normally be applied to a very large 
+safety critical system (i.e. a car or a steam producing boiler plant).
+Th examples here show how the DAG provides a frame work for
+producing skeleton data forms for all these methodologies.
 
 
 \section{Extracting Fault Trees from the DAG}
diff --git a/thesis.tex b/thesis.tex
index 0d852b6..6c0d9b2 100644
--- a/thesis.tex
+++ b/thesis.tex
@@ -141,14 +141,14 @@
 
 \chapter{FMMD functional~groups to \\derived component example : Non Inverting Op-AMP}
 \newboolean{dag}
-\setboolean{dag}{false} % boolvar=true or false
+\setboolean{dag}{true} % boolvar=true or false
 \newboolean{pld}
 \setboolean{pld}{true} % boolvar=true or false
 \typeout{ ---------------- non inv op amp}
 \input{noninvopamp/noninvopamp}
 
 \chapter{FMMD functional~groups to \\derived component example : Inverting Op-AMP}
-\setboolean{dag}{false} % boolvar=true or false
+\setboolean{dag}{true} % boolvar=true or false
 \setboolean{pld}{true} % boolvar=true or false
 \typeout{ ---------------- non inv op amp}
 \input{invopamp/invopamp}