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diff --git a/logic_diagram/logic_diagram.tex b/logic_diagram/logic_diagram.tex
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--- a/logic_diagram/logic_diagram.tex
+++ b/logic_diagram/logic_diagram.tex
@@ -157,6 +157,14 @@ With these three visual syntax elements, we have the basic building blocks for a
 
 \section{Formal Description of PLD}
 
+\begin{figure}
+ \centering
+ \includegraphics[width=200pt,keepaspectratio=true]{./logic_diagram/examplepld.jpg}
+ % examplepld.jpg: 443x244 pixel, 72dpi, 15.63x8.61 cm, bb=0 0 443 244
+ \caption{Propositional Logic Diagram General Example}
+ \label{fig:examplepld}
+\end{figure}
+
 Definitions of concrete and abstract PLD's follow.
 Well-formedness conditions for PLD's are separated from this definition, because of 
 practical differences between the way they are used to represent software as opposed to
@@ -167,9 +175,12 @@ The concrete definitions for PLD's and Spider Diagrams\cite{howse:sd} share many
 \subsection{Concrete PLD Definition}
 
 A concrete {\em Propositional logic diagram} is a set of labelled {\em contours}
-(closed curves) in the plane. The minimal regions formed by the closed curves
+(closed curves) in the plane (examples of closed curves a,b,c are shown in figure \ref{fig:examplepld}). 
+The minimal regions formed by the closed curves
 can by occupied by `test cases' (represented by asterisks).
-The `test cases' may be joined by joining lines.
+The example diagram in figure \ref{fig:examplepld} has fournumbered test~cases, TC1, TC2, TC3 and TC4.
+The `test cases' may be joined by joining lines. The example diagram (figure \ref{fig:examplepld}) shows two joining lines
+R1 and R2.
 A group of `test cases' connected by joining lines
 is defined as a `test case disjunction' or Spider.
 Spiders may be labelled.
@@ -435,7 +446,10 @@ mode of the functional group, therefore in the higher level diagram
 each $SMG$ is represented by a contour.
 
 
-\input{fmmdstereoexample}
+%\input{fmmdstereoexample}
+
+% Here need some kind of example like the stereo separates.
+
 
 {
 \definition{
@@ -470,7 +484,6 @@ validation and consistency checks applied.
 
 \section{Example Diagrams}
 
-
 \subsection {How to read a PLD diagram}
 
 %#