Level 1 Schedule:

L1 Schedule is the Executive Summary, also called a Project Master Schedule (PMS). This is a major milestone type of schedule; usually consists of only one page, and it highlights major project activities, milestones, and key deliverables for the whole project.

It is used to summarize the project schedule in reports and other documents when a more detailed schedule is not required.

Frequently developed by the ‘Client’ as part of its initial feasibility studies for the project then maintained by the contractor; may be used to assist in the decision-making process (go/no-go, prioritization, and determining the criticality of projects).

It can be used to integrate multiple contractors / multiple project schedules into an overall program schedule. Audiences for this schedule Level include (but are not limited to) Clients, Senior Executives, and General Managers. If included with a bid and/or the Contract, it demonstrates conformance to contractual and other milestones.

When it comes to Oracle Primavera P6 Level 1 schedule, it will be shown as one bar only. This bar summarizes the project data as per the below photo.