AAOM Handbook

Each Scheduling Model Activity shall specify the following resource data; • labour Resource Types, and • equipment Resource Types. Resource Types are the categories of labour and equipment used in executing Production and/or Service work for either one or many processes. A specific Resource Type should be defined for each of the 20% of labour types and equipment types/capability that make up 80% (the Pareto set) of the capacity required for Production or Service work in the OMS. Each of these high impact Resource Types should represent resources that are equivalent/ interchangeable, e.g. mechanical fitters, electricians, mill operators, jumbo drills, 50t dump trucks, etc. The remaining resources can be grouped into one or a few Resource Types, based on the significant common characteristics of the resources, e.g. civil trades, light trucks etc. That is, we approach the modelling of resources, using Resource Types, in the same way as we approached the modelling of Work Packages via Activities in the OMS. Note that determining the Pareto set of Resource Types may require a few iterations, using feedback from the forecast Resource Type demand profiles output from the OMS. To cater for the situations where variability in Resource Type demands will be significant, the model must allow a probability distribution to be entered for these values. The probability distribution for a Resource Type demand shall, as a minimum, be defined by; • the values of the minimum, maximum, mean and mode of the distribution, • the 'shape factor' (i.e. spread of the distribution – e.g. standard deviation), In cases where the variability in resourcing will not be significant in determining the confidence of meeting performance targets the model shall use a mean value only.

Each Activity triggered by a specific date (or date range) shall be connected to a calendar so as to forecast the Activity when the date is reached.

Each Activity triggered by calendar time accumulation shall be connected to a calendar time accumulator so as to forecast the Activity each time the accumulator reaches a whole increment of the trigger value. Each operating (usage) parameter triggered Activity shall be connected to the appropriate accumulator so as to forecast the Activity each time the accumulator reaches a whole increment of the trigger value.

Each Activity that is triggered by the scheduling of another Activity shall be connected so as to forecast the Activity when the trigger event is scheduled.

The dependencies between Service and Production work Activities shall be set up so that constraints imposed by Service work are reflected in the Production work schedule and output forecasts.

When the Scheduling Model is run; • evaluation of trigger points shall commence from the trigger start value,

© McAlear Management Consultants 2006

Operational Planning: Set Operating Master Schedule

Updated: August 2018

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