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34 147 22 story points per iteration 4 weeks 5 $7,500 = SP / V = 147 / 22 = 67 7 =I D =7 4 = 28 weeks = I DN DC = 7 5 7,500 = $262,500
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Total Project Stories Total Project Story Points (SP) Development Team Velocity (V) Iteration Duration (D) Developer Number (per Iteration) (DN) Developer Cost (per Developer per Iteration) (DC) Estimated Iterations (I)
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Table 14-4
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Back Office Billing and Inventory Project: Initial Estimates
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point (for example, 95 hours per function point) In such cases, the project delivery rate must be combined with an additional project cost rate (for example, $125 per hour) in order to estimate the project s cost
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Allocating Stories to Individual Project Iterations
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Prior to the start of each project iteration, story points can be utilized to help ensure that the appropriate number and size of stories are allocated to the iteration Once again, this requires that all the project s stories have been identified and sized in story points and that the likely development team velocity is known To allocate stories to the next project iteration, select a group of stories with a total story point size approximately equal to the development team velocity Of course, other constraints and dependencies beyond the story point size may impact which stories can or must be selected for inclusion within a particular iteration When allocating stories to a project iteration, either the developers can make use of the story point sizes determined at the project s initiation, or they can choose to reassess each potential story to determine anew its story point size By reassessing the stories, the developers are able to consider any new or changed information they have acquired since the project began that may impact that size Example Table 14-5 shows the allocation of a group of five stories to iteration 4 for the Back Office Billing and Inventory project
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14:
Iteration Number Velocity Allocated Stories 4
estimating for agile Software Development
22 story points per iteration Story Number Story Points 11 5 12 8 19 3 23 5 26 3 Total Total 5 24
Table 14-5
Back Office Billing and Inventory Project: Allocated Stories
Note that the total story point size for the five allocated stories is 24 story points, which is two more than the likely velocity of 22 story points per iteration This highlights two factors First, the likely velocity should be viewed as an average value only, and second, the number of story points allocated to any story is not so precise that it should necessarily restrict the inclusion of a story into an iteration if good reasons exist for that inclusion For Agile projects sized using Function Point Analysis, the likely speed of delivery can be used to allocate stories to an iteration First, however, the speed of delivery may need to be adjusted to address the iteration duration If each iteration has a duration of 2 weeks, but the speed of delivery is expressed in function points per month (for example, 60 functions points month), then the number of function points to be delivered needs to be halved to properly address the iteration duration (for example, 30 function points per 2-week iteration) Individual stories can then be allocated to each iteration in turn, up to the function point size limit for the iteration
Reviewing the Process at Project Completion
The effectiveness of using story points for Agile project estimation can be continuously improved by ensuring that an estimation review always takes place after the project is completed The review should investigate the actual duration and cost required to deliver each story and should compare those actual values against the estimated values Doing this will help the developers understanding of how to effectively allocate story points to stories and will also help to fine-tune the likely development team velocity
Benefits of Agile Software Estimation Using Story Points
For developers working with an Agile software development approach, using story points for project estimation offers a number of benefits over more traditional approaches These include Story point based estimation has been devised in conjunction with, and specifically for, the Agile development approach The concepts and terminology used in story point based
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