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Delay Navigator

Delay Navigator is a screen that helps you answer a fundamental question: Why an activity is late.

Delay navigator is a screen that helps you "navigate" the complicated web of your schedule dependencies and help you figure out why something is late easily & hassle free. 

  • Select an activity
  • The tool starts from the specified activity and goes backwards predecessor by predecessor. 
  • It compares your schedule with your baseline and based on the changes offers a recommendation of why something is late. 

It looks at the following changes: 

  • Start Date
  • End Date
  • Duration
  • Addition of new activities
  • Constraint alterations
  • Relationship alterations

 

How does it work? 

An activity gets 'Delay Contribution' assigned to it if: 

  • It’s duration gets increased.
  • It starts later than it should without being pushed by a predecessor.
  • If the constraint assigned on it is altered in a way that it delayed its start or end date.
  • A relationship assigned to an activity is altered in a way that it delayed its start or end date.

What happens if an activity only transmits delay and does not cause it? 


Sometimes activities in a path only transmit delays down the line. They get pushed by a predecessor and they push their successor by an equal amount but don’t cause any delay on their own. In order to avoid cluttering the screen we “hide” those activities behind three dots in the connection line. 

The lines with 3 dots can be clicked which will result in a pop up showcasing those in between activities. These activities are the path with the least amount of float between those 2 cards.

Which activities show up in the Delay Navigator canvas?

After the calculations have been made, activities with Delay Contribution equal or greater than 1% or 1 day of 'Delay Contribution' show up in the canvas. The criteria that activities need to meet in order to get Delay Contribution assigned to them are as follows:

Delay Contribution Conditions

Delay contribution is assigned based on the following condition:



Should not be Level of Effort or Summary

AND

[ Duration Delay in Calendar Days > 0 OR Start Delay in Calendar Days > 0 ]



Delay Contribution may then be broken down to:

  1. Duration Delay:

    Business days duration delay OR non-business days duration delay

  2. Start Delay:

    Own start delay, i.e., delay that cannot be explained by delay of the predecessors, delay of any constraint or relationship alterations.

    • Constraint Alteration: If the primary constraint type or date change, e.g., constraint date moved forward.
    • Relationship Alterations: If a relationship between two activities has changed, e.g., a Start-To-Start relationship was changed to Finish-To-Start.
  3. Constraint Alterations:

    If the primary constraint type or date change, e.g., constraint date moved forward.

  4. Relationship Alterations:

    If a relationship between two activities has changed, e.g., a Start-To-Start relationship was changed to Finish-To-Start.

 

I want to decide the Delay Contribution on my own!

Our own algorithm created by our scientists reads the data and calculates delay contribution for each activity in Contribution Mode. However, since there are a lot of intricacies in legal frameworks across countries, companies and legal contracts, we are also offering a Dates mode showcasing all available data, for the experts to decide themselves.  You can switch into that mode by selecting "Check Dates" at the top right

Highlighting Activity Codes

You can also filter the activities in the graph based on their Activity codes to see which of your suppliers, activities, or contractors have the most delay contributions.

 

Cases where the Delay Navigator will not run

  1. Having a single file uploaded in your project.
  2. Having no baseline set.
  3. Having the baseline as the currently selected schedule.
  4. Attempting to investigate an activity whose finish date has not been altered between the 2 schedules.
  5. Attempting to investigate an activity which is part of a network with cycles.

Understanding Delay Navigator better through examples

Scenario 1

Activity X has a Total Delay of 10 days (Finish Delay). This delay is affected by Activity A’s transmitted delay to Activity X and its own Timespan Change.

Scenario 2

Activity X has a Total Delay of 10 days (Finish Delay). This delay is affected by Activity A’s transmitted delay to Activity X and its own Timespan Change.

Glossary

Total Delay (Finish Delay)

Absolute days difference between planned finish and actual finish.

 Total delay = 10 days

 

Timespan

The timespan is the sum of Working and Non-working days.

 Timespan = 85 + 45

 

Working Days Change

Working days difference between planned and actual.  
 

 Working days change = +50 days

 

Non Working Days Change

Non Working days difference between planned and actual e.g weekends and bank holidays.

 Non Working days change = +28 days

 

Start Delay

Absolute days difference between planned start and actual start.

 Start delay = 10 days

 

Transmitted Delay

How much of an activity’s delay is being leaked to the next activity, pushing its Start date (or Finish date if the relationship is Finish-Finish).

 Transmit. delay = 10 days

 Activity’s Actual Finish + Actual Lag - Successor’s Planned Start

 

Advanced

 

How do we compute Relationship Alteration Contribution?  
 

  • We have two scenarios: Scenario A is the current schedule. Scenario B is the current schedule, with the relationships of the baseline schedule. Note that scenario B, preserves everything else from scenario A, including the activity durations of the current schedule.
  • Each relationship in each scenario is scheduled independently of the other relationships. This gives us a successor start date for each relationship in each scenario.
  • Delay due to Relationship alteration is defined as: Difference between successor start dates in two scenarios, if scenario A successor start date > scenario B successor start date.
  • Delay due to Relationship alteration constitutes part of the current start delay

 

How do we compute Constraint Alteration Contribution?  
 

  • We have two scenarios: Scenario A is the current schedule. Scenario B is the current schedule, with the constraints of the baseline schedule. Note that scenario B preserves everything else from scenario A, including the activity durations of the current schedule.
  • Each activity with a constraint in each scenario is scheduled independently of the other activities. This gives us a start date for each activity with a constraint in each scenario.
  • Delay due to Constraint alteration is defined as: Difference between start dates in two scenarios, if scenario A start date > scenario B start date.
  • Delay due to Constraint alteration constitutes part of the current start delay.
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