\label{sec:chap3}

\section{Historical Origins of FMEA}
\subsection{FMEA designed for simple electro-mechanical systems}

\section{Reasoning Distance}
\section{Comparison Complexity}



\section{FMEA - General Criticism}

\subsection{FMEA - General Criticism}

\begin{itemize}
   \item FMEA type methodologies were designed for simple electro-mechanical systems of the 1940's to 1960's.
   \item Reasoning Distance - component failure to system level symptom
   \item State explosion - impossible to perform rigorously
   \item Difficult to re-use previous analysis work
   \item Very Difficult to model simultaneous failures.
  
\end{itemize}

%




\subsection{FMEA - Better Methodology - Wish List}
 

\subsection{FMEA - Better Metodology - Wish List}

\begin{itemize}
  
    \item State explosion  
   \item  Rigorous (total coverage)
    \item Reasoning Traceable  
    \item Re-useable
  \item Simultaneous failures
  % \item  
\end{itemize}

%FMEDA is a modern extension of FMEA, in that it will allow for 
%self checking features, and provides detailed recommendations for computer/software architecture,
%but