Opisowa definicja.
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Level 4 Schedule:
Execution Schedule, also called a Project Working Level Schedule. Level 4 is the detailed working level schedule, where each schedule is an expansion of part of a Level 3 schedule, and is established within the integrated project schedule. This is the key working level CPM schedule displaying the activities to be accomplished by the project workforce and is required for every project. The dates generated by the schedule activities represent the anticipated start and completion of work required to complete the project.
https://planningengineer.net/schedule-levels-level-1-5/