| Document Date: 2009-02-01 06:18:16
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Company Based Systems / / / Event Product Issues / / IndustryTerm software system / software engineering / mechanical and electrical equipment / family car / downward travel / reactive devices / bank / software objects / mechanical devices / web browser / car drivers / upper and lower travel limits / telephone switch / realistic systems / real gate equipment / electromechanical equipment / upward travel time / bank account database / gate equipment / software developer / software development / intellectual tools / / Organization Open University / / Person Controlling Traffic / Irrigate / Michael Jackson / / Position Instructed Healthy Gate Eq’pt Healthy Gate Eq’pt Schedule Edit Schedule Editing Machine Farmer / Dubious Gate Eq’pt Farmer / model data structure / farmer / writer / bank manager / farm engineer / software developer / Farmer Sluice Controller / Controller / engineer / / Product state / symptoms / states / / PublishedMedium the Risks Digest / / Technology GPS / recombination / /
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Some Principles and Ideas of PFA: the Problem Frames Approach (Draft of 30th JanuaryMichael Jackson, The Open University Abstract