Forward and backward scans: EST, LST, minimum completion time and the critical path

What this note covers

1. What the two scans are actually for
2. The forward scan, step by step
3. Minimum completion time: the error assessors keep reporting
4. The backward scan, step by step
5. Reading the critical path off the scans
6. Laying out the diagram so the marks are visible
7. Handling the variations examiners build in
8. How this is examined in the SACE paper and what separates a top answer

8 sections · 12 key terms & formulas · 6 common mistakes