Outline of story to tell in comments

papers/fmea_software_hardware/software_fmea.tex

@@ -4,37 +4,22 @@
 
 % Software FMEA
 % 
-% 
-% Glaring hole in approvals FMEA is performed on hardware
-% and electronics, but with software we only get guidlines ( which mostly consist of constraints!)
-% 
-% No known method of software failure mode effects analysis--- some work has been done on
-% Sofware FTA a top down approach---
-% Bottom up approach means all known failure modes must be modelled.
-% SIL does not have metric or tools to analyse software for safety,
-% it instead applies best practises and constraints on computer language features (i.e.
-% in C limited use of pointers  no recursion etc).
-% 
-% 
-% Introduce concept of FMEA
-% * bottom up
-% * all failure modes for all componnts
-% 
-% Concept of FMMD
-% 
-% Look at the structure of software
-% * a natural hierarchy
-% 
-% Software written for  a controlled
-% Contract programming
-% * describe concept
-% * describe how this fits in with failure modes and failure symptoms concepts
-% 
-% Describe how contract programming represents the failure modes of software
-% 
-% Now describe how this fits in with the structure of FMMD
-
 
+% soandso recomends inital PHA, for the purpose of example
+% let us assign an application to this 4->20mA input ---
+% PHA - pretend its a boiler water level -- too low hazard of explosion CRITICAL
+%       to high and we get superheated water in the steam DANGEROUS
+%
+% System Level SFMEA
+% checklist, interrupts, synch etc
+%
+% detailed level 
+% variable maps
+%
+% then present complete results of SFMEA
+%
+% alongside HFMEA
+%
 
 \documentclass[twocolumn]{article}
 %\documentclass[twocolumn,10pt]{report}