Measuring Process Maturity

Using the CMMI, an organization can plan and execute a process improvement strategy based on industry best practices and a proven approach. The staged representation of the CMMI provides five levels of process maturity:

Maturity level 1: Initial

Maturity level 2: Managed

Maturity level 3: Defined

Maturity level 4: Quantitatively Managed

Maturity level 5: Optimizing

In the staged representation, maturity levels 2 and higher consist of a series of process areas that form evolutionary plateaus of process improvement and performance. For example, the maturity level 2 process areas are:

  1. Requirements Management
  2. Project Planning
  3. Project Monitoring and Control
  4. Supplier Agreement Management
  5. Measurement and Analysis
  6. Process and Product Quality Assurance
  7. Configuration Management

The determination of an organization's maturity level is accomplished by conducting a formal assessment such as the CMM-Based Appraisal for Internal Process Improvement (CBA IPI), Software Capability Evaluation (SCE), or Standard CMMI Appraisal Method for Process Improvement.

The Standard CMMI Appraisal Method for Process Improvement (SCAMPI) is designed to provide benchmark quality ratings relative to Capability Maturity Model Integration (CMMI) models. It is applicable to a wide range of appraisal usage models, including both internal process improvement and external capability determinations. SCAMPI satisfies all of the Appraisal Requirements for CMMI (ARC) requirements for a Class A appraisal method and can support the conduct of ISO/IEC 15504 assessments.

SCAMPI v1.1 enables a sponsor to do the following:

  1. Gain insight into an organization's engineering capability by identifying the strengths and weaknesses of its current processes.
  2. Relate these strengths and weaknesses to the CMMI model.
  3. Prioritize improvement plans.
  4. Focus on improvements (correct weaknesses that generate risks) that are most beneficial to the organization given its current level of organizational maturity or process capabilities.
  5. Derive capability level ratings as well as a maturity level rating.
  6. Identify development/acquisition risks relative to capability/maturity determinations. [3]

    [3] Standard CMMI Appraisal Method for Process Improvement (SCAMPI), Version 1.1: Method Definition

When conducting a SCAMPI, a lead assessor authorized by the Software Engineering Institute (SEI) at Carnegie Mellon University works with a trained assessment team to gather and examine objective evidence and relate it to the CMMI. Data is gathered from questionnaires, organizational and project documents, interviews with organizational personnel, and presentations.

Based on the evidence, observations are written for each CMMI practice in the scope of the assessment. The ultimate objective for data gathering at the practice level is to characterize the extent to which each practice, or a satisfactory alternative practice, is implemented in the organization, and how well that implementation supports the associated process area goal. As data gathering continues, evidence is captured at the project or group level and then aggregated to the organizational level. After sufficient evidence has been obtained and evaluated, the assessment team characterizes organization-level implementation for each practice in the scope of the assessment according to this scale:

  1. Fully implemented
  2. Largely implemented
  3. Partially implemented
  4. Not implemented

After the assessment team has characterized the implementation status of each practice, preliminary findings are generated. The preliminary findings are presented to the interview participants such that the findings can be confirmed or countermanding evidence can be gathered. Separate presentation sessions may be conducted for managers, project managers, and practitioners in order to encourage open communication, and thereby gather data with higher integrity.

Presentations of the preliminary findings are typically the assessment's last activity in the data-gathering phase prior to rating process area goals and determining the maturity level. Using the data gathered throughout the assessment, the team exercises professional judgment in determining whether the goals associated with each process area are satisfied. The goal ratings determine the organization's maturity level. The organization's maturity level is the highest level at which all goals are satisfied, and all goals at lower levels are also satisfied. In other words, in order for an organization to achieve CMMI maturity level 3, the organization must have satisfied all of the goals associated with the level 2 and level 3 process areas.

What Is Software Quality?

Software Development Process Models

Fundamentals of Measurement Theory

Software Quality Metrics Overview

Applying the Seven Basic Quality Tools in Software Development

Defect Removal Effectiveness

The Rayleigh Model

Exponential Distribution and Reliability Growth Models

Quality Management Models

In-Process Metrics for Software Testing

Complexity Metrics and Models

Metrics and Lessons Learned for Object-Oriented Projects

Availability Metrics

Measuring and Analyzing Customer Satisfaction

Conducting In-Process Quality Assessments

Conducting Software Project Assessments

Dos and Donts of Software Process Improvement

Using Function Point Metrics to Measure Software Process Improvements

Concluding Remarks

A Project Assessment Questionnaire

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Metrics and Models in Software Quality Engineering
Metrics and Models in Software Quality Engineering (2nd Edition)
ISBN: 0201729156
EAN: 2147483647
Year: 2001
Pages: 176
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