AAOM Handbook

MS.10 Can Timing be Adjusted Within Trigger Tolerance

Context

The baseline forecast produced by the Scheduling Model will place Activities within the Schedule based strictly on the scheduling parameters, and Production work to Service work dependencies, that were specified when the Activities were set up in the model. These included a nominal trigger value for each Activity and a range of tolerance (variation) permitted on that trigger value. Within the Scheduling Model it is the nominal trigger value that will determine the placement of an Activity within the Baseline Schedule output. The Baseline Schedule may not align all of the forecast Work Packages to maximise the synergies and minimise the potential conflicts between packages. For example, the Baseline Schedule may show two Service work packages that restrict process output as occurring separately when scheduling tolerances would allow them to be aligned. However, an experienced person reviewing the Baseline Schedule can often readily identify such synergies and conflicts. In this case it is possible to adjust the scheduling of forecast Work Packages, within the range of tolerance allowed by the Production and Service strategies, in order to optimise process output and/or the resourcing for the Schedule.

Purpose

To identify Activities that can be moved from their nominal placement in the Operating Master Schedule, in order to optimise synergies and resolve conflicts, without breaching the trigger tolerance on the Activity.

Quantity

• One set of decisions on which Activities can be moved in the Schedule to optimise synergies and resolve conflicts, without breaching the trigger tolerance on any Activity.

Quality

In making these decisions consider the following criteria; • Activities based on an Operate to Failure (OTF) strategy should not be moved in the schedule (they will happen when they happen), • select the simplest changes that can optimise the schedule, • confine potential schedule movements to a point that is within the trigger tolerance for the Activity, and • check for potential new conflicts created if an Activity is moved.

Time

At each forecasting cycle.

© McAlear Management Consultants 2006

Operational Planning: Set Operating Master Schedule

Updated: August 2018

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