1 Part 1: Fundamentals of the V-Modell

1.3 Basic Concepts of the V-Modell

1.3.7 Decision Gates

The »Project Execution Strategy defines a fundamental framework for the ordered and replicable execution of a project. The project execution strategy specifies the sequence of the »Project Progress Stage to be achieved during the project. As shown in Figure 7, the achievement of a project progress stage is marked by a decision gate. A »Decision Gate indicates a milestone in the project sequence, where the current state of the project has to be evaluated. For every decision gate, the V-Modell defines a quantity of products which must be submitted in state »Finished at the end of the project progress stage. Based on all submitted products, the higher management decides whether the »Project Progress Stage was completed successfully and whether the next »Project Section may be entered.


Figure 7: Project Execution Strategy, Decision Gates and Products

Figure 8 shows all »Decision Gate available in the V-Modell. The decision gates are differently coloured to show the belonging to the project types.

The decision gates »Project Approved, »Project Defined, »Iteration Scheduled and »Project Completed are used in all project types and, thus, also in each project execution strategy.

The system development is represented by the decision gates »Requirements Specified, »System Specified, »System Designed, »Detailed Design Completed, »System Elements Realized, and »System Integrated . The decision gates »Overall Project Partitioned and »Overall Project Progress Revised are used when the project is subdivided into several sub-projects before the specification of the requirements.

The decision gates that deal with the relationship between aquirer and supplier are »Request for Proposal Released , »Offer Submitted, »Contract Awarded, »Delivery Conducted, »Acceptance Completed and »Project Progress Revised.

Finally, the project type »Introduction and Maintenance of an Organization-Specific Process Model also includes the decision gates »Process Model Analyzed, »Process Model Improvement Specified and »Process Model Improvement Implemented.

The decision gates allocated to the project types and depicted in Figure 8 provide a specific, fundamental framework for the project execution in the V-Modell. The »V-Modell Reference Tailoring describes the sequence of decision gates for every project execution strategy possible in detail.

Together with the project execution strategy, the decision gates specify "what" shall be done "when", i.e., when shall the products be finished.

The case that a decision gate cannot successfully be passed is not planned in advance in the V-Modell. If the »Steering Committee has reasons not to declare a decision gate as passed, the following possibilities exist:


Figure 8: Decision Gates of the Project Execution Strategies