With this approach, you take the time spent in (or estimated for) the planning
phase and use industry standard percentages (or percentages from the organization’s
own experiences) to calculate estimates for the other SDLC phases. Industry standards
suggest that a “typical” business application system spends 15% of its effort
in the planning phase, 20% in the analysis phase, 35% in the design phase, and 30%
in the implementation phase. This would suggest that if a project takes four months
in the planning phase, then the rest of the project likely will take a total of 22.66
person-months (4 .15 22.66). These same industry percentages are then used to
estimate the amount of time in each phase (Figure 2-10). The obvious limitation of
this approach is that it can be difficult to take into account the specifics of your individual
project, which may be simpler or more difficult than the “typical” project.
With this approach, you take the time spent in (or estimated for) the planningphase and use industry standard percentages (or percentages from the organization’sown experiences) to calculate estimates for the other SDLC phases. Industry standardssuggest that a “typical” business application system spends 15% of its effortin the planning phase, 20% in the analysis phase, 35% in the design phase, and 30%in the implementation phase. This would suggest that if a project takes four monthsin the planning phase, then the rest of the project likely will take a total of 22.66person-months (4 .15 22.66). These same industry percentages are then used toestimate the amount of time in each phase (Figure 2-10). The obvious limitation ofthis approach is that it can be difficult to take into account the specifics of your individualproject, which may be simpler or more difficult than the “typical” project.
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