what is the purpose of system vision document
Vision document A Vision Document is a document that describes a compelling idea or values or future state for a particular organization, product or service. It defines the stakeholders view of the product/service to be developed, specified in terms of the stakeholders key needs and features. Containing an outline of the envisioned core requirements, it provides the contractual basis for the more detailed technical requirements. It is much shorter and more general than a product requirements document or a marketing requirements document, which outline the specific product plan and marketing plan respectively.
Technology roadmap Developing a roadmap has three major uses.[3] It helps reach a consensus about a set of needs and the technologies required to satisfy those needs, it provides a mechanism to help forecast technology developments, and it provides a framework to help plan and coordinate technology developments.