Types of problem

A scheduling problem has a specific type.

A problem has one of the following types:

Problem type

Description

Associated with

Activity/Location Size

The allocated location is too small for the activity.

This problem can occur when activity size increases, or location capacity decreases.

Activity

Avoid Deferred Resourcing Constraint

The allocation of one or more resource types, or the allocation of student sets, has been deferred for the activity.

One problem is created for each resource type that allocation is deferred for, or for student sets.

This problem occurs in the following scenarios:

  • An activity is scheduled when the defer resource option is enabled.
  • The Schedule Special function is used to schedule the activity. One or more resource types, or student sets, is not selected in the Schedule Special window.

Activity

Avoid Double Booking Constraint

The resource or student set is allocated to two activities that occur at the same time.

Resource

Student set

Avoid Resource Mismatch

A resource that is allocated to the activity does not satisfy the activity's requirements.

This problem occurs in the following scenarios:

  • Too few resources are allocated.
  • Too many resources are allocated.
  • An inappropriate resource is allocated. For example, a location that is too small; a staff member who does not satisfy the activity's suitability criteria; a piece of equipment that is not owned by or shared with the department that the activity is associated with).

Activity

Avoid Sequencing

The activity occurs after one or more of the activities that it must precede. Or, the interval between the activities in the relationship is not between the minimum and maximum intervals specified in the relationship.

When the sequencing relationship is broken, one problem is generated; the activity that must precede has the problem.

Activity

Avoid Concurrency

A pair of resources that must not be used simultaneously are currently allocated to simultaneous activities. Avoid Concurrency relationships between resources are created in Enterprise Desktop Reference Data Manager.

An Avoid Concurrency relationship between two student sets specifies that the activities attended by one of the student sets must not occur at the same time as the activities attended by the other student set. A student might be allocated to both student sets.

If activities that must remain clash free occur simultaneously, a Avoid Concurrency problem is generated. Avoid Concurrency relationships on student sets are created in Enterprise Course Planner.

Resource

Student set

Free Block

Within the timetable of the specified resource, an insufficient number of time blocks are free of activity.

A free block constraint consists of one or more time blocks (for example, All Day Monday; All Day Tuesday; All Day Wednesday), and a number that specifies how many of those blocks must remain free of activity.

Resource

Maximum Hours

Within a specified time block, the total duration of the resource's activities exceeds the specified limit.

Resource

Maximum Work Span

Within a specified time block, the interval between the start of the resource's first activity and the end of its last activity exceeds the specified limit.

Resource

Maximum hours per Week

The total duration of the resource's activities during a week exceeds the resource's maximum hours limit.

The limit is determined by the value of the resource's Maximum Periods property, which is set in Enterprise Desktop Reference Data Manager.

Resource

Non Contact Time Constraint

The sum of the resource's non contact time requirement and the total duration of their activities during a week exceeds the resource's maximum hours limit.

The limit is determined by the value of the resource's Maximum Periods property. The non contact time requirement of a resource is specified by the value of its NC Time property. Both properties are set in Enterprise Desktop Reference Data Manager.

Resource

Resource break

The resource does not have a sufficient number of consecutive free periods in each time block specified in the constraint.

Resource

Same Time Activities Constraint

The activity is not scheduled at the same day and time as other activities that it has a same time activity relationship with.

One problem is raised for each same time activity relationship that is broken. A same time relationship can involve several activities.

Activity

Share with Department

The activity is allocated a resource that is not shared with the activity's department.

Activity

Suggested Time Constraint

The activity's scheduled day or scheduled time do not match its suggested days and suggested time. See Activity properties.

Activity

Travel Tables

The resource has insufficient time to travel between the listed activities. Travel times are read from the specified travel table. A problem is raised for each infeasible journey that the resource is required to make.

Resource

Unavailability

The activity is scheduled at a time when it is unavailable, or during a week when it is unavailable.

The resource is allocated at a time when it is unavailable, or during a week when it is unavailable.

Activity

Resource



Scientia Ref: 4047. For Enterprise Timetabler 3.14. Copyright © Scientia Ltd. 2018