软件工程实践者的研究方法chapter21.ppt
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1、1These slides are designed to accompany Software Engineering:A Practitioners Approach,7/e(McGraw-Hill 2009).Slides copyright 2009 by Roger Pressman.Chapter 21nProject SchedulingSlide Set to accompanySoftware Engineering:A Practitioners Approach,7/e by Roger S.PressmanSlides copyright 1996,2001,2005,
2、2009 by Roger S.PressmanFor non-profit educational use onlyMay be reproduced ONLY for student use at the university level when used in conjunction with Software Engineering:A Practitioners Approach,7/e.Any other reproduction or use is prohibited without the express written permission of the author.A
3、ll copyright information MUST appear if these slides are posted on a website for student use.2These slides are designed to accompany Software Engineering:A Practitioners Approach,7/e(McGraw-Hill 2009).Slides copyright 2009 by Roger Pressman.Why Are Projects Late?nan unrealistic deadline established
4、by someone outside the software development groupnchanging customer requirements that are not reflected in schedule changes;nan honest underestimate of the amount of effort and/or the number of resources that will be required to do the job;npredictable and/or unpredictable risks that were not consid
5、ered when the project commenced;ntechnical difficulties that could not have been foreseen in advance;nhuman difficulties that could not have been foreseen in advance;nmiscommunication among project staff that results in delays;na failure by project management to recognize that the project is falling
6、 behind schedule and a lack of action to correct the problem3These slides are designed to accompany Software Engineering:A Practitioners Approach,7/e(McGraw-Hill 2009).Slides copyright 2009 by Roger Pressman.Scheduling Principlesncompartmentalizationdefine distinct tasksninterdependencyindicate task
7、 interrelationship neffort validationbe sure resources are availablendefined responsibilitiespeople must be assignedndefined outcomeseach task must have an outputndefined milestonesreview for quality4These slides are designed to accompany Software Engineering:A Practitioners Approach,7/e(McGraw-Hill
8、 2009).Slides copyright 2009 by Roger Pressman.Effort and Delivery TimeEffort CostImpossible regiontdEdTmin=0.75TdtoEoEa=m(td4/ta4)development timeEa=effort in person-months td=nominal delivery time for schedule to=optimal development time(in terms of cost)ta=actual delivery time desired 5These slid
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