Capacity Intervals

Introduction

A Capacity Interval defines an interval of time over which the capacity to do work is affected. Capacity Intervals determine when a Resource is available and how much work can be done over each time span. Capacity Intervals are used to specify Normal Online time, Offline Time, Overtime and Potential Overtime.

If a Capacity Interval is "recurring" then it affects the capacity of multiple time intervals instead of just one. Capacity Intervals are assigned to Resources via the Gantt Chart. Once a Capacity Interval is created and linked to one Resource, it can be "shared" among other Resources by dragging and dropping it on another Resource.

Note that if a Resource has no Capacity Intervals specified then it is assumed to be online at all times. Also, every Resource is assumed to be continuously online after the last Capacity Interval on the Resource so that Activities can always be scheduled.

Define Resource Capacity

Resource Capacity is defined by a combination of two things:

  1. The Resource's Properties:
    • Capacity Type: Single-Tasking, Infinite, Multi-Tasking
      • Single-Tasking: Only one Activity can be scheduled to a Resource at any one time.
      • Infinite: Any number of Activities can be scheduled to a Resource at any given time. Often used for modeling subcontractors who are assumed to have infinite capacity.
      • Multi-Tasking: Multiple Activities can be scheduled to a Resource simultaneously but is still finite capacity constrained based on the Operations' Attention Percent
    • Cycle Efficiency Multiplier: Multiplies Operation standard cycle times to adjust lengths
    • Setup Efficiency Multiplier: Multiplies Operation standard setup times to adjust lengths)
  2. Capacity Intervals
 

Defining Capacity Intervals

There are four types of Capacity Intervals that can be applied to Resource to specify their Capacity:

  • Online:  These specify regular shift availability of Resources, such as 8 to 4 Monday to Friday.
  • Offline:  These specify special periods when the Resource is not available, such as holidays, breakdowns, vacations, etc.  It is not necessary to specify Offline Intervals for regular shifts.  The absences of an Online Interval indicates an Offline period.
    Note: An Offline Interval can either be set to mark a Resource as unavailable, but Resources can also be marked as unavailable by creating another Offline Interval and laying it over an Online Interval. This is particularly useful when only a portion of the normal Online Interval is being disrupted.
  • Overtime:  These specify that a Resource is available but usually at a premium cost or as an irregular occurrence.  Overtime periods are treated just like Online periods by the Scheduling Engine.
  • Potential Overtime:  These are treated just like Overtime but they are marked differently so that they can be used for evaluating "what-if" situations where you are considering adding overtime but are not yet sure.

If a Resource has no Online (or Overtime/Potential Overtime) Capacity Intervals then it is assumed to be online 24 hours a day, 7 days a week, 365 days a year except for where it is explicitly marked offline using Offline Intervals. However, if a Resource has one or more Online Capacity Intervals then its availability is dictated by those Intervals. In addition, every Resource is assumed to be continuously online after the last Capacity Interval on the Resource so that Activities can always be scheduled.

 Creating Capacity Intervals from the Gantt

The controls to create Capacity Intervals are at the base of the Gantt. To create a Capacity Interval,

  • Specify the default duration of the interval in the "hours" box
  • Specify whether the Capacity Interval will be added to only the Resource clicked, to all Resources in the same Department, Plant or all Plants
  • Click one of the Capacity Interval type buttons, such as "Online" to specify the type of Interval to create
  • Click the Resource to create the Interval starting at the time you click (Hold the Alt key to round to the neares 1/4 hour)
  • Click the "arrow" button when finished creating Capacity Intervals

To edit a Capacity Interval,

  • From the Gantt, double click the Interval or right click a Capacity Interval and select Open
  • This displays the Capacity Interval Dialog

To move a Capacity Interval,

  • From the Gantt, click and drag the Interval from its center to move it earlier or later

To resize a Capacity Interval,

  • From the Gantt, click and drag the Interval from its right edge to make it longer or shorter

To copy a Capacity Interval to another Resource,

  • From the Gantt, drag it to another Resource

To remove a Capacity Interval from one Resource without deleting it,

  • From the Gantt, drag it to another Resource that already has that Capacity Interval assigned

To delete a Capacity Interval (from All Resources)

  • From the Gantt, right click it
  • Select Delete