This is a recommended practice for writing software requirements specifications. It describes the content and qualities of a good software requirements specification (SRS) and presents several sample SRS outlines. This recommended practice is aimed at specifying requirements of software to be developed but also can be applied to assist in the selection of in-house and commercial software products. However, application to already-developed software could be counterproductive. When software is embedded in some larger system, such as medical equipment, then issues beyond those identified in this standard may have to be addressed. This recommended practice describes the process of creating a product and the content of the product. The product is a software requirements specification. This recommended practice can be used to create such software requirements specification directly or can be used as a model for a more specific standard. This recommended practice does not identify any specific method, nomenclature, or tool for preparing an SRS.