| Alternative |
One of several valid ways of doing something: another resource for a task, another branch of a process or another proposal for an incident |
| Backtest |
A test of a forecast against past data: it predicts with what was known at the time and compares with what happened |
| Cover |
The solution to an absence: who works the shift of the person who is missing |
| Current plan |
The accepted plan, the one being executed |
| Feasible |
A plan that meets all hard rules |
| Fixed task |
A task the engine does not move |
| Hard rule |
Always met |
| Horizon |
How far the plan reaches in time |
| Makespan |
The moment the last task in the plan finishes |
| Minimum or maximum wait |
Time that must pass, or must not pass, between two linked tasks |
| Objective |
What the plan tries to improve |
| Outdated proposal |
A proposal computed with data that has since changed |
| P50, P80, P90 |
Forecast scenarios: the consumption that is not exceeded half, 80% or 90% of the time |
| Pareto front |
The set of plans in which one objective cannot be improved without worsening another |
| Precedence |
An ordering rule: one task goes after another |
| Proposal |
A computed plan awaiting a decision |
| Remaining margin (potential) |
The usage margin an asset has left until its next service |
| Reorder point |
Stock quantity below which you order. It is the window demand at the chosen service level |
| Replanning |
Recomputing the plan after a change, fixing what is already running |
| Resource |
What does the work and has a capacity: machine, workshop, asset, person |
| Review period |
How often a supplier is ordered from. It is added to the lead time to get the forecast window |
| Safety stock |
What is held above the expected window demand to absorb variation |
| Service level |
Out of 100 replenishments of an item, how many arrive before stock runs out |
| Soft rule |
Met as far as possible; what is not met is penalised |
| Stock policy |
The service level required for each item level. Several are compared with their cost and one is chosen |
| Window |
Supplier lead time plus review period: how long stock has to last until the next delivery |
