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This chapter also outlines how stories can be sized using Function Point Analysis (FPA) and how the data in the ISBSG Repository can be utilized to determine a project team s likely velocity The decomposition of an Agile project into features using stories and then sizing those stories using story points can be viewed as similar to the way Function Point Analysis decomposes a software project into data and transactional functions and then sizes those functions using function points2 Likewise, the Agile estimation concept of development team velocity, expressed in terms of story points (delivered) per iteration, is similar to the Function Point Analysis based estimation concept of speed of delivery, often expressed in terms of function points (delivered) per month Because an Agile project consists of a number of fixed-length iterations, it makes sense that Agile estimation focuses first on determining the number of iterations required Once that number is known, it is usually a straightforward procedure to calculate estimates for both project schedule and cost by combining the required number of iterations with the iteration duration and the number and cost of development personnel involved
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In an Agile project the relative size of each story to be delivered is measured using story points
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The Story Point Scale
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Estimators allocate story points to stories from a fixed set of possible values A commonly used set of values is a scale that begins with six numbers from the Fibonacci sequence and continues with one or two substantially larger numbers Example Story point scale: 1, 2, 3, 5, 8, 13, 20, 50 This approach allows estimators to allocate story points quickly, because they are working from only a small set of possible numbers, and confidently, because the magnitude of each number is significantly different from the numbers on either side of it It is unnecessary and unhelpful to have a story point scale that continues with larger numbers than that proposed here Any story allocated 50 or even 20 story points is too large for effective management and control within a single iteration If any such stories are identified, they should be decomposed into a number of smaller and more manageable stories that are then reassessed to determine their story point size
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Function Point Counting Practices Manual: Release 43, International Function Point Users Group (IFPUG), 2009
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Calibrating the Story Point Scale Using Past Projects
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Story points are a relative size measure This means that the same story delivered by different development teams could quite rightly be allocated different numbers of story points To address the relative size issue, the story point scale to be used in Agile estimation must be calibrated to accurately reflect the size of stories typically delivered by the one or more development teams within an organization that plan to utilize that story point scale In addition, it is necessary to ensure that all developers who will be involved in devising estimates have an effective understanding of the relative sizes within the story point scale Estimators must calibrate and understand the story point scale before using it to estimate a new project Calibration begins by selecting one or more past projects Selected past projects need both to be similar to the target projects to be estimated and to have had delivery that progressed at a typical rate For the calibration projects, story points are retrospectively allocated to their stories based upon their actual delivery duration All future estimators need to study the individual stories and their allocated story point values so as to gain a proper understanding of the relative sizes of stories associated with each of the values in the story point scale Example Table 14-1 lists actual durations for the stories delivered for a project that has been completed in the past Table 14-1 also shows the allocation of story points to each story based upon those actual durations Future estimators would need to study these allocations along with the details of each story to gain an appropriate understanding of the relative sizes of stories associated with each of the values in the story point scale Prior to using the story point scale for estimation of new Agile projects, future estimators should gain expertise in the technique by practicing allocating story points to stories from other past projects where the actual story duration and, hence, likely allocated story point size, can be checked As an alternative to story points, stories can also be sized in function points using Function Point Analysis This is done by applying the standard Function Point Analysis approach to each story An organization might choose to size its stories using function points for a number of reasons: The organization has substantial Function Point Analysis expertise The organization wishes to utilize external sources (such as the ISBSG Repository) to determine likely speed of delivery (development team velocity)
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