A work package (WP) is a part of the project that is not further subdivided in the work breakdown structure and can be at any level of subdivision (definition according to DIN). If possible, the work package should be defined as a self-contained element with clear boundaries and interfaces to other work packages, so that it can be delegated to an organizational unit for processing. It forms the last and lowest element in a branch of the work breakdown structure. In further detailed planning, the work package can be broken down into individual tasks (activities). However, these activities are not listed in the work breakdown structure, but in detailed network and bar charts. The sum of all work packages gives the complete picture of all the work that needs to be done to achieve the project goal. (Source: GPM)