The substantial criteria of an implementation of AFC can be matched by adequate requirements management tools. Requirements management is a customer-oriented approach in order to take into account the demands of both the customer and the management, to communicate them to the implementation teams, and to continuously compare the aimed-at implementation with the request in order to detect deviations already during the development process.

The requirements management process can be divided into four phases:

• Entering the business requirements.
• Getting the requirements priorities right.
• Assigning the requirements to the planned implementation phases.
• Checking the implementation in each phase by comparing with the business requirements.

The process begins by entering the business requirements which are the base for the concept. The core requests are laid down and are edited in understandable form for the course of the project. Thus, the valid core business targets are defined.

When the core business targets have been defined by means of user scenarios, the requested functionality and the performance are laid down. A priority ranking is used for the subsequent introduction of the services. It all types of users - customers as well internal users. For a successful conversion from traditional fare collection to AFC, all users of the system must be taken into consideration. Then the requests are once more matched against the targets, and it becomes immediately evident which requests have not yet been transferred to the model.

Equipped with these structured requirements originating from customer and business requirements, the development team disposes of all necessary information in order to plan the implementation.

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