Modeling Wait Time Scenarios - LiquidPlanner

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Modeling Wait Time Scenarios

There are two ways to model wait time in LiquidPlanner. Both methods free up your resources so they can work on something else during the wait period.

Which method to choose?

  • Using Wait Time: When time spent waiting shouldn’t be included in a project’s remaining effort, then applying wait time to a dependency is the way to go. Set the number of days to wait, and LiquidPlanner will count them down automatically.
  • Using Virtual Members: When the hours or costs associated with waiting need to be accounted for in the project roll up, using a task assigned to a virtual member is recommended.

Both methods are described in detail below.

Adding Wait Time to a Dependency

You may have a task that cannot begin until a certain number of days have passed since the preceding task was completed. In this case, set a delay on the dependency, or wait time.  This is helpful when you’re waiting on client feedback or for a machine to produce a part and you don’t want that “wait time” or “lag” to roll up to the remaining effort on your project.

To set a wait time on an existing dependency, go the Dependencies section of the Edit Panel for the predecessor or the dependent item.  In the “Wait Time” field, select the number of days or business days you want to delay the dependency.

  • “Days” are calendar days (includes weekend days)
  • “Week Days” are Monday through Friday (excludes weekend days)

Take a look at the example below.  Brian and Liz are building a website for a client.  Before Liz starts coding the website, Brian needs to first send the wireframes to the client for a few days for review.  Liz knows this process will take at least 5 days, so she will set the wait time on her “Code site” task to 5 days:

Wait Time

Now, the “Code website” task will not be scheduled to start until at least 5 days after the Wireframes task has been completed.

Dependent

When the “Wireframes” task is marked done, the dependency is satisfied and LiquidPlanner will begin counting down the 5 days of wait time. LiquidPlanner uses the number of days entered in the dependency Wait Time field and sets a Delay Until date on the subsequent task. This is why the delay until icon (arrow) is displaying in front of the schedule bar for the “Code site” task below. Once 5 days have passed, Liz will be scheduled to start this task if she has no other higher priority work.

Dependency

If you need to change the wait time duration after the predecessor task has been marked done, you can do so by selecting a new date in the Delay Until field of the edit panel.

Delay Until
When a milestone or event is the predecessor in a dependency with a delay, the wait time will start based on the event or milestone Finish [E], regardless of when the event or milestone is marked done.

Using a Task Assigned to a Virtual Member

When effort or costs associated with wait time need to be accounted for in the project roll up, then create a task to represent the wait time, estimate the effort to model the wait time between tasks, and connect tasks with dependencies as necessary. Create a virtual member that will own the wait time task.

Overdrive Scheduling can be handy to model a period of idle wait time, if you will have multiple wait time tasks occurring simultaneously, which are also assigned to the same virtual resource.

In the example below, the Production tasks are forcing delays between the Final Design and Ship tasks. The Production tasks are owned by a virtual member called “Machine3” and the effort for both tasks is rolling up to the project level.

Modeling Wait Time_1

A real member in the workspace needs to log progress on behalf of the virtual member and mark the task done when wait time is complete.

 

Related Articles

Dependencies
Overdrive Scheduling
Virtual Members

Modeling Wait Time Scenarios was last modified: December 9th, 2016 by Marta Searles

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