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Relationship Links

Who can use this feature?

Task Owners, Assignees and Admins can add relationship links between tasks

Relationship Links in Aphex allow you to establish task dependencies, ensuring tasks are completed in the correct order. Whether you need tasks to start together, finish together, or follow one another, Relationship Links help keep your project on track and aligned.

Drawing Relationship Links

You can draw links directly on the Gantt - just click and drag from one bar to another. The link type is set based on where you start and end. It’s quick, visual, and often the easiest way to build out your logic as you go.

How to Draw a Relationship Link:

  • Hover over the Predecessor Task Bar and click the

  • Click and drag from the predecessor to the successor

  • Release the mouse to automatically create the relationship.

Link Type and Direction
Direction
Visual
Explainer

Start > Start (SS)

The second task starts when the first task starts.

Start > Finish (SF)

The second task finishes when the first task starts.

Finish > Start (FS)

The second task starts when the first task finishes.

Finish > Finish (FF)

The second task finishes when the first task finishes.

Scheduling Behaviour

  • Moving a driving task will reschedule all dependent successors in the chain

  • Tasks won’t lose their link logic - rescheduling respects the original structure

  • Updates happen in real time as you adjust dates, add delays or drag bars on the Gantt

Linking Multiple Tasks

Checkboxes let you select multiple Tasks and build logic between them all at once. Set the sequence, adjust the link type & lag, and apply. It’s the fastest way to build out a full section of your plan.

To Link Multiple Tasks:

  • Hover over tasks and click

  • Click the Link icon in the multi-select toolbar

  • Choose the link type (SS, SF, FS, FF), add any lag if needed and confirm

Link Modal

If the Task you want to link to isn’t visible, drop your link on the blue search icon. A menu will open so you can quickly search and select the right Task without changing your filters or losing your place.

How to Link Tasks using the Link Modal:

  • Hover over the Predecessor Task and click the

  • Click and drag to

  • The Link Search Modal will appear. Use the search bar or filters to find the task you want to link.

  • Select the task, choose the link type, and apply the relationship.

Creating Links from a Specific Task

When you open a Task, you’ll see a full list of its linked Tasks, including direction, type, and lag. From here, you can make changes or add new relationships; no dragging or switching views required.

Adding a relationship link from the Task Panel:

  • Open the Task Panel for the task you want to link.

  • Scroll to Related Tasks and click

  • The Link Search Menu will appear. Use the search bar or filters to find the task you want to link.

  • Select the task, choose the link type, and apply the relationship.

Editing Links

You can edit or break existing relationship links at any time to update or remove connections between Tasks.

How to edit an existing Link:

  • Hover over an existing Link and click the Link

  • Optionally change the Link Type or add lag and click

Breaking Relationship Links:

  • Hover over an existing Link and click the Link

  • Click

Lag

Lag lets you add a space between linked Tasks, helping account for handovers, wait times, or real-world gaps without shifting tasks manually.

Add Lag to Relationship Links:

  • Open the Task Panel for the Task you want to link.

  • Scroll to Related Tasks and click into and enter a value

Lag Rules

  • The Predecessor Task Calendar is used to determine Lag when added to a relationship link

  • When drawing Links on the Gantt, Aphex applies zero-day lag, snapping the successor to come immediately after the predecessor

  • Hold Shift while drawing the link to keep the existing gap - Aphex will automatically calculate and apply the right lag to preserve the spacing between tasks

Understanding Scheduling Behaviour

Understanding scheduling behaviour helps you predict how linked tasks behave when dates change based on whether they're Planned, Promised, or Done. It’s the key to controlling movement, Ripple Status, and Progress Updates in your plan.

  • Successor is Planned:

    • Both tasks reschedule freely.

    • Successor follows any changes to the Predecessor.

  • Successor is Promised or Done:

    • Successor won’t move.

    • Only the Predecessor shifts.

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