AAOM Handbook

MS.15 Adjust Master Schedule

Context

The Operating Master Schedule (OMS) provides a roadmap of the work activities appropriate to delivery of the business expectations, and the distribution of the duration for each activity. The OMS is the approved specification of the Right Work, Right Time and Right Way As with any map an OMS can only be used effectively if we are able to accurately identify and track our current position against the expected position and desired end point. To achieve this we need an appropriate level of forecast detail and must provide regular, timely and accurate feedback of actual versus expected progress at this same level of detail. A usable rolling forecast will be made up of the; • actual frequency and duration of the events linked to each OMS Activity, for each reporting interval to date, plus • projected distributions of frequency and duration for the remainder of the OMS time horizon. It is possible that some of the more significant decisions taken in the Execution Scheduling process, in order to manage critical issues, may result in material changes to the forecast for future OMS reporting intervals. When this situation arises it is necessary to reflect the impact of these decisions in the OMS forecast.

Purpose

To maintain a reliable OMS forecast.

Quantity

In the event of a significant execution Scheduling decision, with material impact on the OMS forecast for future reporting intervals (but not the current reporting interval), the following information should be updated to the OMS. For each low sample rate Service Activity in the OMS; • The change in the measurement period in which the event is forecast, and/or • The duration of the event. For each high sample rate Service Activity in the OMS; • The change in the total number of occurrences of events linked to the Activity in the measurement periods, and • The average duration of the events.

For each high sample Production Activity in the OMS; • The change in the output distribution for the measurement period,

© McAlear Management Consultants 2006

Operational Planning: Set Operating Master Schedule

Updated: August 2018

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