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an IFpUG Function point Case Study
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his chapter outlines and demonstrates how functional size measurement can be applied to determine:
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The functional size of a sample set of new development user requirements
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The functional size of a sample set of enhancement user requirements Once the functional user requirements for each sample set are identified, functional size measurement is done using one of the ISOrecognized functional size measurement methods This case study uses the IFPUG method1 You should read the preceding chapter, A Brief Tutorial on Functional Size Measurement (FSM), before reading this chapter
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For the first example we will establish the functional size for the new development of a piece of software We have chosen the planned development of an Employee Records Management system for our case study This relatively straightforward system provides a good framework on which to display how to go about functional sizing
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See ISO/IEC 20926: 2009 Software engineering IFPUG 43 Functional Size Measurement Method Counting practices manual
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Sample Set of User Requirements
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The following list represents a sample set of user requirements for a new development software project: 1 The software application must store and maintain employee information consisting of the following data fields: name, employee number, rank, street address, city, state, ZIP code, date of birth, phone number, office assigned, and the date the employee data was last maintained 2 The software application must provide a means to add new employees, update employee information, terminate employees, and merge duplicate employee records (in cases where all fields other than employee number are identical)
3 The software application must provide a scheduled weekly report Its header includes the Report Period and provides a retrieved list of all employees (Name and Employee Number) where information has changed within the previous 7 calendar days (report period) 4 The application must provide a means for the end user to view an employee s data 5 User security data (user ID, password) is referenced from the security application for user logon security validation 6 Complex algorithms are used to encrypt the employee date of birth so that it cannot be directly read from the information stored for an employee
7 The software application must provide subsecond response time for data maintenance processes during the peak business hours between 8 am and 5 pm Eastern USA Standard Time (GMT 5) 8 The software application must use programming language(s) that are compatible with open systems design and Oracle databases
Functional User Requirements
Functional size represents the size of the subset of user requirements known as the functional user requirements (that is, what functions the software must support), which excludes quality and technical requirements Of the preceding list of user requirements, 1 through 5 represent the functional user requirements, while 6 through 8 are nonfunctional (quality and technical) requirements Only requirements 1 through 5 will be used to determine the functional size of the software
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an IFpUG Function point Case Study
Functional Size Measurement Using ISO/IEC 20926: 2009 IFPUG 43
Functional Size Measurement Method: IFPUG 43 identifies the following five base functional components for determining functional size:
Note The terms application and software application are used interchangeably in the following narrative Internal logical file (ILF) This persistent logical entity is maintained by a standard elementary process (function) of the software application External interface file (EIF) This persistent logical entity is maintained by another software application, and referenced only by this software application External input (EI) This elementary process of the application has the primary purpose of processing data entering the application boundary and either maintains the data contained in an ILF or controls the behavior of the application External output (EO) This elementary process of the application has the primary purpose to present data to a user (that is, data exits the application boundary to a user ) At least one (or more) of the following logic steps must be part of the elementary process: Calculation Derivation of data Update of at least 1 ILF Control of the behavior of the application External query (EQ) This elementary process of the application retrieves data from at least 1 ILF or EIF for presentation to a user The elementary process cannot include any calculations, derived data, updating of an ILF, or control of the application s behavior
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