Scrum is an iterative, incremental framework for project management often seen in agile software development, a type of software engineering. wikipedia.org

a user story is an informal, natural language description of one or more features of a software system. User stories are often written from the perspective of an end user or user of a system. wikipedia.org

Management in business and organizations is the function that coordinates the efforts of people to accomplish goals and objectives using available resources efficiently and effectively. wikipedia.org

Software documentation is written text that accompanies computer software. It either explains how it operates or how to use it, and may mean different things to people in different roles. wikipedia.org

A technical writer (also called a technical communicator) is a professional writer who engages in technical writing wherein he or she designs, creates, and maintains technical documentation. wikipedia.org

Manual testing is the process of manually testing software for defects. It requires a tester to play the role of an end user, and use most of all features of the application to ensure correct behavior. wikipedia.org