what do you call a functional specification for existing application? I have an existing application and I need to redo the application. It has no documentation for it, and I have been asked to write a functional breakdown spec. I have no problem breaking down the application, but I was looking for a document template to use .
You can try IEEE 1016-1998: "IEEE 1016-1998, also known as the Recommended Practice for Software Design Descriptions, is an IEEE standard that specifies an organizational structure for a software design description (SDD). An SDD is a document used to specify system architecture and application design in a software related project."