diff --git a/component_failure_modes_definition/component_failure_modes_definition.tex b/component_failure_modes_definition/component_failure_modes_definition.tex
index 9e0030f..08d6908 100644
--- a/component_failure_modes_definition/component_failure_modes_definition.tex
+++ b/component_failure_modes_definition/component_failure_modes_definition.tex
@@ -75,11 +75,21 @@ Let us first define a component.
 This is anything we use to build a product or system. 
 It could be something quite complicated 
 like an integrated microcontroller, or quite simple like the humble resistor.
+
 We can define a 
 component by its name, a manufacturers' part number and perhaps
 a vendors' reference number.
-What these components all have in common is that they can fail, and fail in
-a number of well defined ways. For common components
+
+Geffory Hall, writing in Spacecraft systems engineering\cite{scse}[p.619]
+defines a `part' thus
+``{\em {Part(definition)}---The lowest level of assembly, beyond which further diss-assembly irrevocably destroys the item''
+The term component, in American English, can mean a building block or a part.
+In British-English a component generally is given to mean the definition for part above.
+For this study, we will use base-component to mean a `part', and component
+to mean a part or sub-assembly. 
+
+What components all have in common is that they can fail, and fail in
+a number of well defined ways. For common base-components
 there is established literature for the failure modes for the system designer to consider (often with accompanying statistical
 failure rates)~\cite{mil1991}. For instance, a simple resistor is generally considered 
 to fail in two ways, it can go open circuit or it can short.  
@@ -101,8 +111,8 @@ each failure mode is referenced back to only one component.
 %%-%% The lower resistance part will draw more current and therefore have a statistically higher chance of failure.}.
 
 
-A product naturally consists of many components and these are traditionally
-kept in a `parts list'. For a safety critical product this is usually a formal document
+A products are built using  of many base-components and these are traditionally
+kept in a `parts~list'. For a safety critical product this is usually a formal document
 and is used by quality inspectors to ensure the correct parts are being fitted.
 The parts list is shown for
 completeness here, as people involved with Printed Circuit Board (PCB) and electronics production, verification
diff --git a/mybib.bib b/mybib.bib
index d8f817d..ea06888 100644
--- a/mybib.bib
+++ b/mybib.bib
@@ -135,6 +135,13 @@
   YEAR =         "2005"
 }
 
+@BOOK{scse,
+  AUTHOR =       "Fortescue, Swinerd, Stark",
+  TITLE =        "Spacecraft Systems Engineering ISBN:978-0-470-75012-4",
+  PUBLISHER =    "Wiley",
+  YEAR =         "2011"
+}
+
 @BOOK{bfmea,
   AUTHOR =       "Robin E McDermot et all",
   TITLE =        "The Basics of FMEA ISBN: 0-527-76320-9",
diff --git a/thesis.tex b/thesis.tex
index 85f7a5e..a336b9c 100644
--- a/thesis.tex
+++ b/thesis.tex
@@ -205,9 +205,9 @@ for incorrect temperature.
 reference the MSC document and describe the Java extension classes.
 Software documentation for fmmd tool.
 
-\typeout{ ----------------  Euler Diagrams represented as graphs}
-\chapter {Euler Diagrams \\ Represented as graphs}
-\input{eulerg/eulerg}
+%\typeout{ ----------------  Euler Diagrams represented as graphs}
+%\chapter {Euler Diagrams \\ Represented as graphs}
+%\input{eulerg/eulerg}
 
 \chapter{Fast Zone Discrimination Algorithm}
 \input{fzd/fzd}