4. Select the services portfolio required per building block

Objective Approach Inputs Activities Outputs

Objective

The objective of this step is to select services portfolios for each building block generated in the preceding step.

The services portfolios are combinations of basic services from the service categories in the TOGAF Technical Reference Model that do not conflict. The combination of services are again tested to ensure support for the applications. This is required as a pre-requisite to the later step of defining the architecture fully.

The constraints output from step 2 can provide more detailed information about:

requirements for organization-specific elements or pre-existing decisions (as applicable)
pre-existing and unchanging organizational elements (as applicable)
inherited external environment constraints

Where requirements demand definition of specialized services that are not identified in TOGAF, consideration should be given to how these might be replaced if standardized services become available in the future.

For each Architectural Building Block build up a service description portfolio as a set of non-conflicting services. The set of services must be tested to ensure that the functionality provided meets application requirements.

Inputs

The inputs to this step are:

Business Architecture Version 2
Technical Architecture Version 0.3
TOGAF Technical Reference Model
TOGAF Standards Information Base

Activities

Key activities in this step include:

Produce affinity grouping of services
Cross-check affinity groups against needs
Document service description portfolio for each Architectural Building Block cross-checking for non-conflicting services
Document change requests to architectures in architecture continuum

Outputs

The outputs of this step are:

Technical Architecture Version 0.4
- Technical Architecture - target architecture services (a description of the service portfolios required also known as an Organization Specific Framework)
- Technical Architecture - change requests and/or extensions or amendments to be incorporated in an organization-specific architecture continuum

Step 5:Confirm business goals and objectives are met