Requirement engineering is typically done using a technique called scrum. This is an agile methodology that breaks down software development into short sprints, or cycles. During each sprint, requirement engineers work with developers and other stakeholders to identify and document the requirements for the software. These requirements are then prioritized and used to create a backlog, which is a list of all the features that need to be developed. 

Requirement engineering is the process of gathering, analyzing, and documenting user requirements for a software system. It typically includes activities such as interviews, focus groups, surveys, and workshops. Requirement engineering is also sometimes referred to as software requirements engineering. The goal of requirement engineering is to ensure that the final software product meets the needs of the customer or client. Requirement engineering is an important part of the software development process, and it is typically carried out by a team of specialists known as requirements engineers. 

Requirement engineering often uses techniques from other disciplines, such as project management, marketing, and product management. Requirement engineering is an essential part of Scrum, a popular Agile software development methodology. Scrum sprints typically begin with a meeting called Sprint Planning, during which requirements are gathered and prioritized. Sprint Planning helps to ensure that the work to be completed during the sprint is focused on the most important requirements. 

It is also an important part of Q&A (quality assurance), which is a process used to ensure that products meet certain standards before they are released. Q&A typically includes activities such as testing and reviews. Requirement engineering is an essential part of developing high-quality software products.