diff --git a/report.lyx b/report.lyx
index 17514ab..d9060b0 100644
--- a/report.lyx
+++ b/report.lyx
@@ -361,6 +361,23 @@ key "Bondi:2000:CSI:350391.350432"
  handling increasing load, e.g more users, gracefully.
 \end_layout
 
+\begin_layout Standard
+Fault tolerance is used to raise the level of 
+\emph on
+dependability
+\emph default
+ in a system, so that the dependability is high even in presence of errors.
+ Dependability is defined as the statistical probability of the system functioni
+ng as intended at a given point in time.
+ Fault tolerance is defined as the property of a system to always follow
+ a specification, even in the presence of errors.
+ The specification could take the form of error handling procedures which
+ activate when an error occurs.
+ This means that a fault tolerant, dependable system, will have a very high
+ probability of functioning at a given point in time, and is exactly what
+ is desired.
+\end_layout
+
 \begin_layout Subsection
 Generic
 \end_layout