AAOM Handbook

PL.16 Specify Task Sequencing Context

A work package is to define all the requirements for sustainably (i.e. dealing responsibly with safety, the environment, employees, communities, governments and asset life), correctly and efficiently completing work. The detailed planning process has defined the Outcomes, Specifications, Hazards and Controls, Work Method, Resourcing and Duration of the Tasks comprising the work. In a work package that comprises multiple Tasks it is possible that some Tasks can/must be completed concurrently, and that some must be completed consecutively. There may also be constraints on the time interval between Tasks, either for technical (for example the minimum curing time for concrete) or for sustainability (i.e. dealing responsibly with safety, the environment, employees, communities, governments and asset life) reasons (for example to minimise disruption to a community). This information will determine the duration of the work periods in which the Tasks comprising the work package will be scheduled. Whenever the sequencing of, and time between, Tasks is important to the outcome of the work it must be specified in the work package. This information will be used in the scheduling of the work, and as an instruction to the persons completing the work. Purpose To specify the sequence for completion of work package Tasks. Quantity One specification for the scheduling constraints/precedents on Tasks within a work package. Quality Unless otherwise specified, the sequence of Task numbering within the Work Order will indicate the sequence for scheduling and completing the Tasks. In this case the work package duration will be the sum of the Task durations. When the sequence of Task numbering is not adequate for communicating the sequencing and dependencies of Tasks, an appropriately detailed Gantt chart shall be constructed and incorporated into the work package. The Gantt chart should indicate the sequencing of the Tasks, the dependencies (including critical time intervals) between Tasks, the best case, most likely case and the worst case duration for the Tasks and for the work package as a whole.