kanske skulle har varit arbete installet

mybib.bib

@@ -25,7 +25,7 @@ volume={6351},
 series={Lecture Notes in Computer Science},
 editor={Schoitsch, Erwin},
 doi={10.1007/978-3-642-15651-9_18},
-title={Overcoming Non-determinism in Testing Smart Devices: A Case Study},
+title={Testing Smart Devices: A Case Study},
 url={http://dx.doi.org/10.1007/978-3-642-15651-9_18},
 publisher={Springer Berlin Heidelberg},
 keywords={testing; non-determinism; smart instruments; safety},
@@ -393,6 +393,7 @@ URL = {http://search.ebscohost.com.ezproxy.brighton.ac.uk/login.aspx?direct=true
 Year = {2005}
 }
 
+
 @INPROCEEDINGS{931423,
 author={Throop, D.R. and Malin, J.T. and Fleming, L.D.},
 booktitle={Aerospace Conference, 2001, IEEE Proceedings.}, 
@@ -487,17 +488,14 @@ ISSN={2166-563X},}
   YEAR =         "1980"
 }
 
-@ARTICLE{5492693,
-author={Bishop, P. and Bloomfield, R. and Littlewood, Bev and Povyakalo, A. and Wright, D.},
-journal={Software Engineering, IEEE Transactions on},
-title={Toward a Formalism for Conservative Claims about the Dependability of Software-Based Systems},
-year={2011},
-volume={37},
-number={5},
-pages={708-717},
-keywords={probability;software fault tolerance;uncertainty handling;conservative claims;formal support;probability of failure on demand;software-based system dependability;software-based system reliability;software-based system safety;Battery powered vehicles;Phase frequency detector;Power engineering and energy;Power engineering computing;Programming;Reliability engineering;Software reliability;Software safety;Software systems;Uncertainty;Bayesian probability;safety case;software reliability.},
-doi={10.1109/TSE.2010.67},
-ISSN={0098-5589},}
+@article{silsandsoftware,
+author={Bishop, P.},
+journal={Safety-Critical Systems Club Newsletter, 14(2)},
+title={SILs and software},
+year={2005},
+volume={14},
+number={2},
+}
 
 % $Id: mybib.bib,v 1.3 2009/11/28 20:05:52 robin Exp $
 @article{Clark200519,
@@ -985,8 +983,27 @@ ISSN={1530-2059},}
   TITLE =        " The Joy of Sets: 2nd edition:  ISBN 978-0-387-94094-6",
   PUBLISHER =    " Springer",
   YEAR =         "1993"
-}
+} 
 
+@ARTICLE{5492693,
+author={Bishop, P. and Bloomfield, R. and Littlewood, Bev and Povyakalo, A. and Wright, D.},
+journal={Software Engineering, IEEE Transactions on},
+title={Toward a Formalism for Conservative Claims about the Dependability of Software-Based Systems},
+year={2011},
+volume={37},
+number={5},
+pages={708-717},
+keywords={probability;software fault tolerance;uncertainty handling;conservative claims;formal support;probability of failure on demand;software-based system dependability;software-based system reliability;software-based system safety;Battery powered vehicles;Phase frequency detector;Power engineering and energy;Power engineering computing;Programming;Reliability engineering;Software reliability;Software safety;Software systems;Uncertainty;Bayesian probability;safety case;software reliability.},
+doi={10.1109/TSE.2010.67},
+ISSN={0098-5589},}
+
+
+@MISC{concurrency_c_tool,
+ author =       "D. Sheridan",
+ title  =       "Simple Concurrency Analysis Plugin for Frama-C",
+ howpublished = "Available from https://bitbucket.org/adelard/simple-concurrency",
+ year = "2013"
+}
 
 @MISC{microchip,
   author =       "Microchip",

submission_thesis/CH2_FMEA/copy.tex

@@ -1271,9 +1271,13 @@ That is that the SIF can recognise that it has a fault condition and can take ap
 %
 The MTTF value for each component {\fm} is denoted using the symbol `$\lambda$'.
 %
+\paragraph{SIL and Software.}
 EN61508 regulation in relation to software provides procedural quality guidelines and constraints (such as forbidding certain
 programming languages and/or features): it does not provide a means to trace failure mode effects in software
-or across the software/hardware interface.
+or across the software/hardware interface. 
+%
+While procedural guidelines and constraints can improve software reliability, ensuring that reliability targets, for software,
+are actually met for given SIL levels is currently almost impossible~\cite{silsandsoftware}.
 
 
 %\subsection{ FMEDA - Failure Modes Effects and Diagnostic Analysis}

submission_thesis/CH3_FMEA_criticism/copy.tex

@@ -174,8 +174,9 @@ Modern control systems nearly always have a significant software/firmware elemen
 and not being able to model software with current FMEA methodologies 
 is a cause for criticism~\cite{safeware}[Ch.12]. 
 %
-Some techniques apply conservative estimates of a given software implementation
-and use those to estimate reliability statistics~\cite{5492693}.
+Some techniques apply blanket estimates for a given software implementation, based
+on the verification techniques applied in its testing,
+to aid calculation of system level reliability statistics~\cite{5492693}.
 %Even the traditionally conservative nuclear industry is now
 %facing up to the ubiquity of software in control systems~\cite{parnas1991assessment}.
 Similar difficulties in integrating mechanical and electronic/software
@@ -198,13 +199,16 @@ and FMEA (bottom-up inductive)
 to be performed on the same system to provide insight into the
 software hardware/interface~\cite{embedsfmea}.
 %
-Although this
-should give a better picture of the failure mode behaviour, it
-is by no means a rigorous approach to tracing errors that may occur in hardware
+Subtle problems in embedded software are often due to interrupt contention causing unintended
+corruption of variables: automated tools to aid in the detection of these
+are becoming available~\cite{concurrency_c_tool}.
+%
+Although these
+should give a better picture of the failure mode behaviour, they are by no means a rigorous approach to tracing errors that may occur in hardware
 through to the top (and therefore ultimately controlling) layer of software.
 %
 With the increasing use of micro-controllers in place of analogue electronics
-for most new designs of electronic product, the poor integration capabilities of FMEA
+for most new designs of electronic product, the poor software integration capabilities of FMEA
 are now being seen as deficiencies. 
 
 This is becoming apparent in a  dilemma now faced