Business Analysis: Functional Non-Functional Requirements

Agile is a family of delivery approaches that build a product in short iterations, each producing something usable, so that plans are corrected by what was learned rather than defended against it.

Scrum is a lightweight framework for delivering complex work in fixed-length iterations called sprints, with three accountabilities, five events and three artefacts, defined in a short public guide.

A sprint is a fixed-length iteration of one month or less in which a team plans a goal, builds a usable increment toward it, shows the result, and reviews how it worked, before the next sprint begins immediately.

Scope creep is the quiet expansion of a priced piece of client work through additions that each look too minor to renegotiate, until what gets delivered is substantially larger than what was sold.

A retainer is a recurring fee that holds a supplier's time or availability open across a period, so what the client buys is first call on somebody's attention rather than any named artefact.

A day rate sells a bounded unit of a supplier's working time rather than a finished result, so the client rather than the supplier carries the risk that the job turns out bigger than it looked.