This book covers the methods used to gather and cleanse requirements. The different types of requirements meet the needs of the readers and the stakeholders in any organisation producing products and/or services for both internal and external use. An important part of cleansing requirements is ensuring they are right beyond any doubt and this may require a number of subject matter experts to give their input and approval. To ensure this each requirement needs the automated and manual steps listed and the process descriptions added to each step. This also helps to give clarity to the design and may be the reason for updating the design of the product or service.