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Lead time is the period by which an event in a network plan can be advanced compared to another event. This is represented by a negative time gap.

Lean development is an approach that aims to optimise product development through the application of lean principles such as customer value, the pull principle and continuous improvement. Lean development is the preliminary stage of lean production and concerns the product development process.

Lean production is a production method that aims to make optimum use of resources such as materials, time and labour and to minimise waste.

Lessons learned refers to the process of documenting experiences, findings and mistakes during a project. These lessons are analysed after each major milestone, but at the latest at the end of the project, in order to gain valuable insights that can be used in future projects or project phases to achieve improvements in planning, execution and results.

Life cycle costs cover all costs of a project from start to finish, including construction, operation and maintenance costs.

A line manager, also known as a functional manager, is the person responsible for managing a specific department or function within the organisation.

The line organisation is an organisational structure in which employees report directly to their respective superiors, from the base to top management. In project management, "line" refers to the direct reporting structure of the team members.

Logistics refers to the physical supply of the processes involved in the realisation of a project with the required resources. Not only is the provision of materials or equipment important, but also their maintenance and eventual disposal.