11.3.2.1 Specification Requirements — Written Description is a type of requirement document that provides a comprehensive description of the product or service that is being purchased. It outlines the features, functions, performance criteria, and other technical and non-technical details that are expected of the purchased item. It should be written in a clear, concise, and professional manner so that all stakeholders can understand the requirements. There are two main types of 11.3.2.1 Specification Requirements — Written Description: Functional Specification and Technical Specification. The Functional Specification outlines the desired functionality of the product or service, while the Technical Specification outlines the technical requirements that need to be met in order for the product or service to be successful.