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QQRead:http://www.qqread.com/erp/34/y922143004.html Estimation for (single) Maintenance Tasks
Single maintenance tasks are necessary due to legal, technical or organisational requirements as well as for error correction. Often the effort of such tasks is less than 3 person months and therefore the effort for a Function Point count cannot be economically justified.
1.5（单项）维护任务估算
单项的维护任务无论是对法律、技术以及组织需求，还是对错误纠正来说都是必需的。这样的任务所需的工作量一般不超过3人月，因此对功能点数量进行工作量估算在经济上是不合理的。
The estimation Copmpetence Center of the AXA Service AG developed together with some project leaders an Excel chart with typical tasks and parameters which were considered to be influental for maintenance tasks. To each of these factors there was correlated an estimated effort for estimation which could be changed by plus/minus 100 %. The actual effort could be documented, too. During two years five of the application development departments performed more than 220 estimations using this Excel charts (see Fig. 2).
AXA Service AG的估算评测中心与一些项目领导一起开发了一种电子表格，该表格中列出了对维护任务有影响的一些典型的任务和参数。对于每一种因素都有一个相关的估算工作量，在实际估算中可以对其进行加/减100%的改动。实际的工作量也可以录入该表格中。使用该表格在两年的时间内对五个应用开发部门进行了220多次估算（如图2）。
图2：对开发部门的维护任务估算
这些估算中的90多次都包含了真实的估算工作量（如图3）。
According to this the estimations of the estimated errors in the Excel sheets were changed according to the measured averages. In average the reduction of the former estimated efforts was about 44 % (see Fig. 4).
由此可以看出，表格中的预测错误估算根据测量的平均值进行了修改。平均来说，前期估算工作量的减幅大约为44%（如图4）。
表4和表5展示了对主机和PC开发进行估算的新的电子表格。
图3：带有实际工作量的维护任务估算
图4：预算工作量的实际值
The Maintenance Estimation Sheet for Host Applications
Single maintenance tasks are necessary due to legal, technical or organisational requirements as well as for error correction. Often the effort of such tasks is less than 3 person months and therefore the effort for a Function Point count cannot be economically justified.
1.5（单项）维护任务估算
单项的维护任务无论是对法律、技术以及组织需求，还是对错误纠正来说都是必需的。这样的任务所需的工作量一般不超过3人月，因此对功能点数量进行工作量估算在经济上是不合理的。
The estimation Copmpetence Center of the AXA Service AG developed together with some project leaders an Excel chart with typical tasks and parameters which were considered to be influental for maintenance tasks. To each of these factors there was correlated an estimated effort for estimation which could be changed by plus/minus 100 %. The actual effort could be documented, too. During two years five of the application development departments performed more than 220 estimations using this Excel charts (see Fig. 2).
AXA Service AG的估算评测中心与一些项目领导一起开发了一种电子表格，该表格中列出了对维护任务有影响的一些典型的任务和参数。对于每一种因素都有一个相关的估算工作量，在实际估算中可以对其进行加/减100%的改动。实际的工作量也可以录入该表格中。使用该表格在两年的时间内对五个应用开发部门进行了220多次估算（如图2）。
图2：对开发部门的维护任务估算
这些估算中的90多次都包含了真实的估算工作量（如图3）。
According to this the estimations of the estimated errors in the Excel sheets were changed according to the measured averages. In average the reduction of the former estimated efforts was about 44 % (see Fig. 4).
由此可以看出，表格中的预测错误估算根据测量的平均值进行了修改。平均来说，前期估算工作量的减幅大约为44%（如图4）。
表4和表5展示了对主机和PC开发进行估算的新的电子表格。
图3：带有实际工作量的维护任务估算
图4：预算工作量的实际值
The Maintenance Estimation Sheet for Host Applications
Parameters  更多内容请看计算机维护、硬盘维护与数据恢复专区、系统维护手册专题，或进入讨论组讨论。
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