Appendix C — Formula sheet
Every formula of the module, week-tagged, with a plain-word gloss
Symbols are kept to the textbook’s; every line says in words what the formula does. The sheet grows by one block a week.
Week 1 — productivity (Heizer Ch. 1)
| Formula | In words | Units |
|---|---|---|
| Productivity = output ÷ input | how much comes out for each unit that goes in | guests per person-hour, crates per labor-hour |
| Single-factor productivity = output ÷ one input | one input at a time: labor-hours, kWh, kg of material | titles per labor-hour, units per kWh |
| Multifactor productivity = output ÷ (labor + material + energy + capital + other), all in money | all inputs at once; money is the only unit in which hours, kilograms and kWh can be added | titles per dollar, units per euro |
| Productivity growth = (new − old) ÷ old | the change, always divided by the old value | % |
| Person-hours = people × hours (person-minutes ÷ 60) | the labor input of a task done by several people; 90 person-minutes are two people for 45 minutes | person-hours |
| Time for a task = work in person-minutes ÷ people working (up to the task’s maximum) | more people make a task shorter only until the maximum is reached | minutes |
| Contribution = (sales − production costs − finance costs) × (1 − tax rate) | Fisher Technologies’ comparison of marketing, finance and operations levers | $ or € |
Source: Heizer et al. (2023), Ch. 1; moving-day rules from Handout 2 of Week 1.