====== Creating links between activities ======

In a Time-Location schedule, **links between activities** define
the logical relationships between different operations.

These links allow you to represent:

  * the sequence of works
  * dependencies between activities
  * succession constraints between crews

They therefore help structure the schedule and ensure
the logical consistency of the workflow.

{{:en:time_distance:2026-03-12_22h38_03.png?400|}}

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===== Selecting activities =====

To create a link between two activities, first select the
activities involved.

Hold the **CTRL** key on the keyboard and click successively
on the activities to be linked.

The selection order is important:

  * the **first selected activity** is the **predecessor**
  * the **second selected activity** is the **successor**

This defines the direction of the link in the schedule.

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===== Creating the link =====

Once the activities are selected:

  - **right-click** in the Time-Location view
  - select the **Create link** menu

Several options are available:

  * **Link two activities**  
  creates a direct link between the two selected activities

  * **Link a sequence**  
  automatically creates successive links between several activities

  * **Link multiple activities**  
  allows several links to be created simultaneously

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===== Link visualisation =====

Once created, the link appears directly in the
Time-Location view as a **segment connecting the two activities**.

This link represents the logical relationship between
operations and allows dependencies in the schedule
to be quickly visualised.

Links help with:

  * analysing the logical sequence of works
  * identifying dependencies between crews
  * understanding the overall workflow of the project

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===== Rescheduling the project =====

After creating or modifying links between activities,
it is necessary to **recalculate the schedule**
so that dependencies are taken into account.

To do this, click the **Reschedule** button located
at the bottom right of the interface.

{{:fr:espace_temps:2026-03-06_17h31_51.png?200|}}

Rescheduling allows you to:

  * recalculate activity dates
  * apply the constraints defined by the links
  * update the logic of the schedule

This operation ensures that the schedule correctly
reflects the relationships between activities.

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===== Modifying or deleting a link =====

As with activities, links can be modified or deleted
from the **context menu** accessible by right-clicking.

This allows the schedule logic to be easily adjusted
when the organisation of the works evolves.

In a Time-Location schedule, it is recommended
to create links in the **direction of project progression**
to maintain a clear and logical reading of the schedule.