Objectives

By choosing a certain order of importance for some objectives, a more optimal planning can be obtained.

In the table below, an overview is given of the consequences for the planning:

Criterion Explanation
Minimize Makespan The makespan is the time between the start date of the first operation and end date of the last operation in a set.
This criterion will ensure that the makespan within the generated planning will be as short as possible.

The operations will be distributed over the available resources in the most optimal way. This will generally result in a utilization of all available resources.

Minimize Tardiness Tardiness indicates how long the due date of an operation is exceeded.

This criterion will ensure the total tardiness of all operations together to be as small as possible (X+Y), even though this means a number of orders will be finished too early as a consequence.

Minimize Maximum Tardiness See also: 'Minimize Tardiness'.

This criterion will ensure the maximum tardiness per order to be as small as possible (max(X,Y)).

Minimize Late Orders Only a difference between Whether or Not overdue is made, the time an order is overdue will not be taken into account.

This criterion will ensure that the least possible number of orders will be overdue, even though this means a number of orders will be finished too early as a consequence.

Minimize Total Lag
The lag between 2 related operations is the time between the operations minus the minimum lag.

This criterion will ensure the total lag of all relations in the planning to be as small as possible.

Minimize Resource Usage If an operation can be performed on different resources, the resource with the shortest lead time for the operation will be preferred.

This criterion will ensure the resource usage to be as short as possible.

Minimize Changeovers

This criterion will ensure the operations with the same changeover attribute to be planned after each other as much as possible.

Changeover attributes for operations can be set by the end user.
Examples:
  • Operations for the same item
  • Operations for the same production order
  • Operations for the same customer

Minimize Cost x Dummy criteria for project-based modifications, not used in the standard software.