performance - Analyst Capability (ACAP) calculation in COCOMO -

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i see following information in cocomo documentation:

analysts personnel work on requirements, high level design , detailed design. major attributes should considered in rating analysis , design ability, efficiency , thoroughness, , ability communicate , cooperate. rating should not consider level of experience of analyst; rated aexp. analysts fall in 15th percentile rated low , fall in 95th percentile rated high

  • 15th percentile - low
  • 35th percentile - low
  • 55th percentile - normal
  • 75th percentile high
  • 90th percentile - high

i don't know, how calculate percentiles. maybe there example.

i think answer subjective, , changes company company. measure "analysis , design ability, efficiency , thoroughness, , ability communicate , cooperate" takes combination of self , peer reviews, performance evaluations , expert judgement. can use kind of development ladder assess in percentile scale should be. @ this one example.


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