6.0.3 Types of modification to specifications

The possible modifications of the specifications are basically of different natures:

• Error corrections: modifications which correct overlooked errors or inconsistencies in the specifications.
• Enhancements: modifications that enhance the system, e.g. by new services or features, or by improving performance or decreasing costs.

Modifications of the correction category (i.e. Category F) are ongoing maintenance tasks and are handled with CRs bearing the code of the Work Item that was used to introduce the affected feature, for the original Release in which it was introduced. Corresponding mirror CRs (i.e. Category A) may be produced for subsequent releases as applicable, using the same Work Item code. See also clause 6.2 covering the case where such a CR is not introduced into the TS or TR at the Release with which that Work Item is associated.

Modifications of the enhancement category (i.e. Category B or C) are handled within the concept of Work Items or as "technical enhancements". (See clause 6.2.) Note that prior approval of the WID by the TSG is needed before any substantial work is launched. If that work can be completed within one TSG cycle, the new WID may be approved at the same TSG meeting at which the enhancement CRs are presented. See clause 6.1 for the creation of Work Items.