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Adding sequencing

You can create sequencing relationships between several activities. For example, you can sequence a practical activity after the lectures that its subject matter is taught in.

To add a sequencing relationship, follow these steps:

  1. In the Activity Editor window, click the Sequencing tab. Depending on your current task, the Activity Editor window might be already open:
    • When you manually create an activity, you enter activity properties in the General tab of the Activity Editor window.
    • In all other scenarios, you add sequencing relationships to an existing activity. To edit an activity, right-click it in the table in the Activities tab, then click Edit Activity. The Activity Editor window opens.
  2. In the Activities list on the Sequencing tab, select the activities that you want to add into a sequencing relationship with the activity that you are editing.

    Tip: To change the filter on the list, select an entry from the Filter by list above the Activities list. To remove the filter and display all valid candidate activities, select [None].

  3. Depending on the type of relationship you want to create, click the arrow between the Activities list and the Same Time Activities, Preceding Activities, or Succeeding Activities list. The activities move from the Activities list.
  4. If you add activities to the Succeeding Activities list, set the minimum and maximum gap between activities. The gap is always specified from the perspective of the predecessor activity, so you set the gap only when you add activities to the Succeeding Activities list:
    • To specify a precise gap, use the Time (D:H:M) controls. One day is interpreted as precisely 24 hours.
    • The gap is measured from the end of the preceding activity to the start of the succeeding activity.
    • A maximum gap of 0D 0H 0M means that the succeeding activities must immediately follow the activity that you are editing.
    • Gaps that you specify with the Days controls are interpreted differently. A gap of one day means that the succeeding activity must occur some time on the day that follows the preceding activity, rather than at least 24 hours after it.
  5. To save the sequencing relationships, click OK.

Result: When the sequencing relationships are saved, they affect scheduling:

  • When Enterprise Timetabler schedules the involved activities, their potential days and start times are constrained by the sequencing relationships that they are involved in.
  • If activities are involved in a same-time relationship, then rescheduling one of the activities causes the others to also be rescheduled.
  • If an activity that is involved in a sequencing relationship is already scheduled, but its scheduled day and time break the sequencing constraint, then a scheduling problem is generated.

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