PPMs can be developed
for a wide range of project objectives. Example PPMs include Reliability Models,
Defect Models, and Productivity Models.
Table 19.3 is an example of a simple PPM for predicting effort based on both
the PPB shown in Table 19.2 and organization historical effort distribution. The
PPB elements at the top of the second column (Number of Complex Reqs, Number
of Design Pages, Number of Components, etc.) come from the Unit of Measure
column in Table 19.2. The Estimated Number of Elements column in Table 19.3
PPB Elements Upper Limit Mean Lower Limit Unit of Measure
50.8
29.2
13.4
81.4
44.4
18.6
13.4
35.4
6.54
301.5
32.5
175.5
23.5
49.5
14.5
8.6
21.0
4.3
3.8
6.6
2.1
49.8
31.7
13.3
18.2
19.0
8.0
Systems Test
Implementation
Integration
Requirements Definition
Design
18.5 12.4 6.3 Hours/Test Scenario
Hours/Complex Requirement
Hours/Nominal Requirement
Hours/Simple Requirement
Hours/Complex Requirement
Hours/Nominal Requirement
Hours/Simple Requirement
Hours/Interface
Hours/Design Page
Hours/Object
Hours/Subsystem
Hours/Component
19.
Pages:
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554