Plan from the supplied facts
Fictional effort model is E=10+2s+4i hours, where s is screen count and i interface count. Baseline s=3,i=2 gives 24 hours. Change one input at a time; the model omits interaction effects and is an original planning assumption.
| Case | s / i | Hours | Change from baseline |
|---|---|---|---|
| Baseline | 3 / 2 | 24 | 0 |
| One more screen | 4 / 2 | 26 | 2 |
| One more interface | 3 / 3 | 28 | 4 |
Work through the choice
For a one-unit uncertainty, the interface count has twice the modelled effort effect. This does not make every interface more valuable; sensitivity concerns estimate movement.
If two screens and one interface are added together, what is the modelled increase?
Show the worked answer
2×2+4×1=8 hours; total becomes 32. This follows only because this model is additive with no interaction term.
Material to use in your plan
Keep baseline inputs, the changed input, resulting estimate and delta. Investigate high-impact uncertain inputs first when other discovery costs and consequences are equal.