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Saturday, May 8, 2010

Product Integration (PI) Process Area in CMMi

The purpose of Product Integration (PI) is to assemble the product from the product components, ensure that the product, as integrated, functions properly, and deliver the product. An Engineering process area at Maturity Level 3.

The scope of this process area is to achieve complete product integration through progressive assembly of product components, in one stage or in incremental stages, according to a defined integration sequence and procedures. Throughout the process areas, where we use the terms product and product component, their intended meanings also encompass services and their components.

Specific Practices by Goal

SG 1 Prepare for Product Integration
Preparing for integration of product components involves establishing and maintaining an integration sequence, the environment for performing the integration, and integration procedures. The specific practices of the Prepare for Product Integration specific goal build on each other in the following way.
- SP 1.1 Determine Integration Sequence.
. The product components that are integrated may include those that are a part of the product to be delivered along with test equipment, test software, or other integration items such as fixtures. Once you have analyzed alternative test and assembly integration sequences, select the best integration sequence.

- SP 1.2 Establish the Product Integration Environment.
The environment for product integration can either be acquired or developed. To establish an environment, requirements for the purchase or development of equipment, software, or other resources will need to be developed.

- SP 1.3 Establish Product Integration Procedures and Criteria.
Procedures for the integration of the product components can include such things as the number of incremental iterations to be performed and details of the expected tests and other evaluations to be carried out at each stage.

SG 2 Ensure Interface Compatibility
Many product integration problems arise from unknown or uncontrolled aspects of both internal and external interfaces. Effective management of product component interface requirements, specifications, and designs helps ensure that implemented interfaces will be complete and compatible.

- SP 2.1 Review Interface Descriptions for Completeness.
The interfaces should include, in addition to product component interfaces, all the interfaces with the product integration environment.

- SP 2.2 Manage Interfaces.
Interface requirements drive the development of the interfaces necessary to integrate product components. Managing product and product component interfaces starts very early in the development of the product. The definitions and designs for interfaces affect not only the product components and external systems, but can also affect the verification and validation environments.

SG 3 Assemble Product Components and Deliver the Product
ntegration of product components proceeds according to the product integration sequence and available procedures. Before integration, each product component should be confirmed to be compliant with its interface requirements. This process continues until product integration is complete. If, during this process, problems are identified, the problem should be documented and a corrective action process initiated.

- SP 3.1 Confirm Readiness of Product Components for Integration.
Confirm, prior to assembly, that each product component required to assemble the product has been properly identified, functions according to its description, and that the product component interfaces comply with the interface descriptions.

- SP 3.2 Assemble Product Components.
The assembly activities of this specific practice and the evaluation activities of the next specific practice are conducted iteratively, from the initial product components, through the interim assemblies of product components, to the product as a whole.

- SP 3.3 Evaluate Assembled Product Components.
This evaluation involves examining and testing assembled product components for performance, suitability, or readiness using the available procedures and environment. It is performed as appropriate for different stages of assembly of product components as identified in the product integration sequence and available procedures. The product integration sequence and available procedures may define a more refined integration and evaluation sequence than might be envisioned just by examining the product architecture.

- SP 3.4 Package and Deliver the Product or Product Component.
The packaging requirements for some products can be addressed in their specifications and verification criteria. This is especially important when items are stored and transported by the customer. In such cases, there may be a spectrum of environmental and stress conditions specified for the package.

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