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The IFPUG 43 method counts an enhancement project s functional size by identifying any function that is New (added), Modified (changed), or Removed (deleted) and including it as part of the functional size Once again IFPUG 43 rates each specific base functional component impacted by the project as Low, Average, or High, and the following example illustrates the basic steps to arrive at the enhancement project s functional size (in units of function points) The function point components to be counted based on the functional user requirements include Internal logical file (ILF) No ILFs are New, Modified, or Removed as part of the functional user requirements External interface file (EIF) No EIFs are New, Modified, or Removed as part of the functional user requirements External input process(es) (EI) Count 1 EI for the modified Add Employee EI where the processing logic has been enhanced This was (and remains) a Low complexity EI function and results in: 1 Low EI = 3 FP (modified) External output process(es) (EO) Count 1 EO for the modified Weekly Report function that now includes a calculation step and a new data field The report is a Low complexity function and would result in: 1 Low EO = 4 FP (modified) Note that this function existed as an EQ in the first software release and has been modified (additional logic whereby a calculation is now performed); therefore it is now classified as an EO as a result of the enhancement project It is not counted as a removed EQ function and a new EO function rather it is a single modified function and counted as an EO in the enhancement project
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Determining the Functional Size
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External query process(es) (EQ) No EQs are New, Modified, or Removed as part of the functional user requirements (see EO earlier for the treatment of the Weekly Report) The total functional size expressed in function points is the sum of the individual components: Functional size = New + Modified + Removed Functions = (3 + 4) modified = 7 FP (IFPUG 43) Figure 19-2 shows the context diagram for the functional user requirements included in this functional size
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Add Employee (EI) Update Employee (EI) Delete Employee (EI) Merge Duplicate (EI)
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an IFpUG Function point Case Study
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Figure 19-2 Sample enhancement functional user requirements using IFPUG 43 functional size measurement method
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Types of Functional Size
It is worth noting that functional size is typically used in two major areas (Note that in the ISBSG software project database, only the functional size for new development, redevelopment, or enhancement software projects is included) Application or base software functional size This measure represents the functional size of an installed base software application (Think of it in terms of square meters of a constructed building) The base functional size is a point-intime snapshot of the current size of an application This number is useful whenever comparisons are required between different installed applications (for example, defects/base FP) New development or enhancement project functional size This measure reflects the size of the functional area impacted by a new development or enhancement project An enhancement project size is the result of summing the New functions added in the project, plus the functions Removed from the application by a project, plus the functions Changed (modified) by the project (Think of this count in terms of a renovation project where the square meter size of the project equals the sum of the area of a New living room, a Removed bathroom, and a Remodeled kitchen) This measure is useful in project-based metrics (for example, relative cost in $/development FP) For a new development project, all of the functional user requirements are New therefore, there are no removed or changed functions to be sized, only new (added) functionality
At the end of a new development or enhancement project, the Application or Base FP count must be initialized for new development or updated (if it is an enhancement project) to reflect the actual functional size of the application at this time
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