work estimation

1. Work Breakdown Structure

 

     Three Point Estimate

      effort of Activity = ((Most probable Value * 4) + Pessimistic Value + Optimistic Value)/6

 

2. Lines of Code

    Measure after the coding phase

    Measure at the beginning of maintenance or conversion project

 

 

3. Delphi

    several engineers individually produce estimates and converge on a consensus estimate at last.

3.1 A group of experts is each given the program's SPECs and estimation form

3.2 the experts discuss

3.3 anonymously list project tasks and  a size estimate

3.4 moderator collects the estimates and tabulates the results and return them to the experts

3.5 only each expert's personal estimate is identified; all others are anonymous.

3.6 experts discuss and review the tasks

3.7 continues from step 3.3 again utill converge to within an acceptable range

 

 

4. Function Point

   

    Five aspects considered:

       * External Inputs(EIs), Add&Update&Delete Records

       * External External Outputs(EOs), Records Summary&Details

       * External Inquiries(EQ),an input/output flow where input immediately generates the output, no logical data files modified

       * Internal logical files(ILFs),maintained data model entity

       * External Interface files(EIFs), maintained outside of the application

 

    step1: determine the type of project: development project, enhancement project,installed application

 

    step2: identify the Counting Boundary

 

    step3: determine an unadjusted function point count

 

    step4: Determine a value adjustment factor

 

    step5: Calculate the adjusted function point count