A work-breakdown structure in project management and systems engineering is a breakdown of a project into smaller components. It is a key project management element that organizes the team's work into
Example from MIL-HDBK-881, which illustrates the first three levels of a typical aircraft system
Systems engineering techniques are used in complex projects: printed-circuit-board design, robotics, bridge building, software integration, and spacecraft design. Systems engineering uses a host of tools that include modeling and simulation, requirements analysis, and scheduling to manage complexity.