There are several different schedules a project may have as it moves through its various stages. One is prepared for the bidding process, another is approved once the contract is awarded, and others are required when the work falls behind or the original programme has to be changed following an approved change.
Tender Schedule
Prepared at the bidding stage, the tender schedule is generally not as detailed as what follows since it is based on the information, specifications, and drawings available at tender.
It will typically set out the key milestones and activities, major work sequences, basic resource assumptions, and the proposed duration through to the tender completion date. In essence, it is there to support the tender price and demonstrate to the client that the contractor can complete the work within the proposed time.
Baseline Schedule
Once the contract is awarded, the baseline schedule is the approved programme against which all schedule performance and progress are measured. It is a more detailed document that lays out activity relationships, the critical path, float, and any constraints or calendars being used.
Where necessary, it will also detail planned costs and resources, as well as key milestones and durations. During the project, this is what is used to check actual progress and forecast dates for variance.
Recovery Schedule
If the project is running behind the approved plan and the completion date is at risk, a recovery schedule is prepared. This programme is designed to show how lost time can be recovered and whether the target date is still achievable. To that end, it might call for fast-tracking or crashing of activities, a change in work methods or sequencing, or additional resources, hours, and shifts.
Revised Schedule
Approved changes to the existing programme require a revised schedule. Whether the reason is a variation, a design or scope change, an unforeseen event, or a contractual change, the revised programme will update the dates, activities, and relationships accordingly. If the project's change-control process requires it, the revised schedule can serve as the new baseline.
What Is the Difference?
| Schedule | Main Purpose |
|---|---|
| Tender | Shows the proposed programme during bidding |
| Baseline | The approved programme for project control |
| Recovery | Shows how delays can be reduced |
| Revised | Updates the programme after approved changes |
