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Estimating methods in the project life cycle
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All of the macro-estimation techniques presented in this book can be applied with both approximate and detailed functional sizing However, as the graph shows, the precision of the resultant estimates will improve as the precision of the functional sizing improves
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Producing a Detailed Estimate
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To produce a detailed estimate as opposed to an initial ballpark or indicative estimate for feasibility consideration typically a microestimating technique (for example, work breakdown) will be used to develop the effort estimate A macro-estimating technique can then be used to validate the micro-estimate
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Note Where the macro- and micro-estimates vary by more than 10 to 15
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percent, you should identify why and rework your estimates
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Estimates are best derived from an organization s own experience database You can build your own experience database by entering your project data in the ISBSG Repository6 If you have not yet established your own experience database, you can use the ISBSG Repository as your source for macro-estimations
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Note If you have entered data from your projects into the ISBSG Repository,
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you have the best of both worlds You can extract your projects to derive the project delivery rate (expressed in hours per function point) to be used Then you can extract similar projects from other organizations for comparison The project data from other organizations will be particularly useful where you are estimating a project that includes a variable that you have no previous experience of, for example: a platform or language that you have not used previously
Functional size7 is only one of the many variables known to influence effort, but it is recognized as a key driver As the functional size increases, so does associated effort In its simplest form, this relationship is expressed as: Effort = Size * Project Delivery Rate where Project Delivery Rate is expressed as Hours per Functional Point and hours are effort hours If you are using comparison or analog macro-estimation methods,8 the information shown in Table 1-3 should be included in your set of attributes for selecting similar projects Use your common sense when matching projects and/or adjusting project delivery rates For example: If the only similar project identified was negatively impacted by the learning associated with the introduction of a new technology, but the skills acquired will be utilized by this project, then the project delivery rate (PDR) can be expected to be better (that is, have a lower PDR) than the similar project If this project is similar to a previous project, with the exception that you have to provide additional deliverables (for example, a user manual), then the project delivery rate can be expected to be less productive (that is, higher)
Refer to the appendixes for a detailed description of the data in the ISBSG Repository Go to wwwisbsgorg for information on how to submit projects for inclusion in the Repository For the estimating examples in this book, the functional size measure used is units of function points according to the IFPUG method (FP) Note that all of the IFPUG releases use the same units of measure: IFPUG function points At this printing, the most recent IFPUG release is IFPUG 43 (published in September 2009) For further information visit wwwifpugorg Both these approaches are covered in detail in 13 in this book
practical Software project estimation
Development, Enhancement, or Redevelopment (on a new platform) Functional size measurement In terms of quality, cost, schedule, and constraints (that is, priority of each) Note that cost, scope (functionality and quality), and time (effort) are the famous triple constraint of project management Mainframe, midrange, PC, or multiplatform Programming language or language level Similar project profile in terms of activities and deliverables from those activities (Phases and work activities included)
Project type Size Project goals
Development platform Language Task selection
Table 1-3 Attributes for Estimation by Comparison and Analogy
A commercial estimating tool can be used for estimating using industry data or your organization s experience or knowledge database Be aware that you need to know the basics of software project estimating and how your organization supports estimation before shopping for an estimating tool
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