Document Rationale is a statement of why a document was created and what purpose it serves. It is also sometimes referred to as "Document Justification" or "Document Purpose". Document Rationale is often used in the context of software development, where it is used to explain the purpose of a design document or other technical document. Document Rationale can also be used to explain the purpose of other types of documents, such as policy documents, procedure documents, or other types of business documents. There are two main types of Document Rationale: the Design Rationale, which explains why a particular design was chosen and the Use Rationale, which explains how the document will be used. Document Rationale is an important part of the document development process, as it helps to ensure that the purpose of the document is understood by all readers.