Plan from the supplied facts
Original fictional plan: preparation takes 4 hours once, then each of n independent record types takes 2 hours. Total effort is 4+2n, with no elapsed-date promise. Repeating the preparation inside every item estimate would describe a different plan.
| Record types n | One-off hours | Item hours | Total hours |
|---|---|---|---|
| 1 | 4 | 2 | 6 |
| 3 | 4 | 6 | 10 |
| 5 | 4 | 10 | 14 |
Work through the choice
The slope is 2 hours per added type; the 4-hour intercept is retained even when n changes. State whether preparation is genuinely shared before using this equation.
The scope rises from three types to five. How many extra hours are estimated?
Show the worked answer
4 hours: (4+2×5)−(4+2×3)=14−10. The one-off preparation cancels in the difference.
Material to use in your plan
Use columns one-off task, repeat unit, unit count, hours per unit and total. Write E(n)=F+vn beside the worksheet, with the scope under which F remains shared.