Requirements Stability Index

A requirement stability index (RSI) is a metric used to organize, control, and track changes to the originally specified requirements for a new system project or product. Typically, a project begins, after consultation with customers or clients and research into their needs, with the creation of a requirements document. The document expresses what the customer or client needs and expects and, at least implicitly, what the developer will provide. The client or customer representative group reviews the document and, if in agreement with its specifications, signs it. This process (called signing off) is intended to ensure that customer representatives or clients have agreed - in writing - on the specifics involved.

Almost inevitably, however, once the design and development process is underway, customers or clients think of changes or embellishments they would like, a phenomenon known as requirement creep. An important part of project management, requirements management has become more challenging with the faster pace of technology. The RSI gives developers a means of continuing to document requirements as they change throughout the development process, and to monitor deviations from those originally specified.

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