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Waiting time refers to the specified time period between two events in a project plan, such as between the completion of a task and the start of the next. These breaks can be technically determined or scheduled as buffers for unforeseen delays.

The waterfall model is a project management approach based on a linear and sequential structure. Requirements and goals are defined in advance, and each phase of the project must be completed before the next one begins. This approach is efficient but inflexible, as changes during the project are challenging to implement. It is particularly suitable when few changes are expected during the project.

The Work breakdown structure (WBS) is a systematic breakdown of a project into smaller tasks and work packages. The WBS can be presented graphically or in tabular form and structured functionally, object-oriented, phase-oriented, or a mix of these.

Work contracts are agreements in which one party undertakes to produce something.

A work instruction is a documented procedure or guide describing a specific workflow or task that must be followed for the successful execution of a particular job, activity, or process. Work instructions aim to provide clarity about the workflow and ensure consistent execution.

A work package (WP) is the smallest unit in the project structure plan that is not further subdivided. It includes the activities necessary to complete a specific task. In addition to these activities, an estimate of the duration and cost is recorded. Work packages are usually completed units of work that differ from others and are clearly linked. Work packages are used to organise tasks.

The work package description is a detailed document containing all relevant information about a work package. This includes the sub-task to be completed, the responsible work package manager, the content of the work package, and the planned dates.

The work package owner is a member of the project team. This person is responsible for planning and monitoring a specific work package and is named in the work package description. They establish the necessary steps for the execution of the work package and report progress to the project manager.

Work-in-progress (WIP) is a tool in Kanban. Tasks falling under WIP are currently being worked on. Since multiple tasks are not worked on simultaneously by one person, it regulates the work pace and improves process workflows.