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by using a combination of work breakdown and macro-estimating techniques
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As micro-estimation is a vital part of any project estimation effort, we recommend that you acquaint yourself with the work breakdown estimation technique and use it in addition to macro-estimation techniques
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This technique involves making estimates ranged into three figures: optimistic, realistic (most likely), and pessimistic
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Using Process Models for Micro-Estimation
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Another alternative for the breakdown of macro-activities into operational tasks is to use software life-cycle macro-phases2 and to map these with the process model adopted in your own quality management system, or to use an external standard process model such as CMMI-DEV, SPICE (ISO/IEC 15504-5), or ISO/IEC 12207 Use of one of these will provide a framework to ensure that all standard and repeated activities are included As your projects will then share the same definitions, ambiguities will be minimized, and this will also allow the comparison of projects The result will be a three-tier WBS: Macro-Software Life-Cycle Phase (for example, Design ) Process (according to the chosen process model, for example, Architectural Design ) Task (according to the chosen process model, for example, Review Architectural Design Specification ) Depending upon the process model chosen, it is possible to have a different number of process groups (or categories, depending upon the terminology used) For instance: CMMI-DEV has distributed its 22 process areas into four process categories (Project Management, Process Management, Support, and Engineering) ISO/IEC 15504-5 distributed its 48 processes into three main blocks of processes (Primary, Organizational, Support) for a total of nine process groups (Primary: Acquisition, Supply, Engineering, Operation; Organizational: Management, Process Improvement, Resource and Infrastructure, Reuse; Support: Support) Figure 10-1 compares the two models contents against those categories Two main questions arise from such classification into process categories: What is the impact of the number of process categories on the WBS From a practical viewpoint, some useful information can be gained from a Gantt chart structured using these classifications For instance, it would allow the following: Easier matching of activity types to the related personnel skills required This would provide a more granular classification of a generic analysis process, which would lead to different allocations (and related costs) for functional/business analysts and for technical analysts
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Refer to Project effort breakdown in the Glossary
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CMMI Project Management Process Management Support Engineering ISO 15504 Acquisition (ACQ) Supply (SUP) Engineering (ENG) Operation (OPE) Support (SUP) Management (MAN) Process Improvement (PIM) Resource & Infrastructure (RIN) Reuse (REU)
Figure 10-1
Process categories in CMMI and ISO 15504
Knowledge of the balance between categories and their alignment to expected thresholds for a certain kind/group of projects This will allow you to more accurately assess the effort breakdown for the various project tasks (for example, business analysis) More accurate estimation and planning through an appropriate balance of activities in the project Why choose one reference model over another
Business viewpoint: this could be a case of requiring compliance with a model because it is a de facto standard and will allow for benchmarking (for example, CMMI-DEV) Technical viewpoint two alternatives: Choose a single model Usually, the larger the number of process groups, the broader the coverage of possible processes and related tasks performed in an organization The choice of a specific model (and related number of process categories and processes) should be done in line with the organization s Quality Management Standard purpose and scope Combine models Another option is to merge two models, integrating their best aspects into a single, customized model For instance, CMMI-DEV has a reduced presence of processes related to reuse practices, while ISO 15504 has a devoted process Or if you require more detail for testing or measurement, you could use specific vertical maturity models from those domains
The aim of this figure is to provide a snapshot of comparable groups by processes and related activities, marked with shades Please note that categories that cannot be mapped (for example, Reuse) are shown with a white background
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