Repair (de-bugging) and maintenance work in software field has nothing to do with mass-production or software factories. The schedule and the cost of these activities are not programmable in advance. And a great infrastructure of documentation, control, and surveillance is needed , as well as tacit knowledge of the system and its context.
One can learn a lot about de-bugging and maintenance of software by studying how the Swiss fix their potholes; see "Fixing Swiss Potholes" @
http://research.stlouisfed.org/wp/2001/2001-025.pdf
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