Chapter 5 Product planning课件.ppt

精品 Some suggestions on using the job number log When to guess(猜测) and when to estimate（估计） The first jobs of a given type, you have to guess since there is no perior data. In estimating the time for a new job, you may use the To Date Rate for the most recent perior job of the same type. Add a column of Job # in the Time Recording Log. 精品 Using Job number log to make a plan for next week To estimate the times for the next week product, look in Job number Log and get most recent product time and to date rates data of the same type work and then make an estimate by that data. Considering the new features of the new job that different to old jobs of the same type. 精品 使用作业编号日志制定基本的产品计划 假设现在要编写两个程序，其中一个程序比以前做过的任何一个程序都复杂，另一个为中等难度，试估计编写这两个程序所要用的时间。 查看作业编号日志，这里记录着编写前三个程序的平均时间是113.7分钟，最长时间是158分钟。 中等难度的程序大约会用2小时即120分钟； 比较复杂的程序至少要用158分钟甚至更长的时间。为了保险起见，假定这个复杂的程序要用3.5个小时即210分钟； 这两个程序的编程时间预计一共需要120＋210＝330分钟。 精品 Balanced estimate (均衡估计) A balanced set of estimates has about as many overestimates as underestimate. The advantage of having balance estimates is that on average your jobs will take about as long as you estimated. The key to good estimating, however, is to learn to make balanced estimates. 精品 summary When completed, the job number log provides the average,maximum, and minimum times taken to complete each of your project so far. You can use this information to plan work for the next week. 精品 Assignment 5 Record job number log for the work you will do for this course. Using your daily time logs to complete these forms. 精品 Chapter 6  Product size 精品 This chapter describe How to： Size measurement Size estimate More precise measure 精品 The product planning process Making plan for each job you do 审查相似项目数据 原来花的时间 Compare the plan with actually did Better understand the errors Learn how to make better plans Improper estimation is one of the principle reasons for project failures. 精品 精品 Size measurement 平均阅读速率=337/77＝4.38min/页 根据章的规模和以前的平均阅读速率（以分钟/页为单位）来进行估计，就有可能作出比较准确的估计。 精品 Som