Project resources, schedules, plant and workforce planning

Work packages and resource requirements

Resource planning connects a defined work package with people, plant, time, space, information and supporting services. A work package is a manageable portion of the project with a clear scope and completion condition. It is not simply a machine booking or a target tonnage. Without a clear boundary, an estimate can be numerically correct and still omit essential work.

Include the activities that make production possible: investigation, technical review, required authorisations, protective arrangements, access, monitoring, maintenance, transport and handover. Some are performed by specialists; others are shared across the site. They consume time and capacity even when no material is being removed.

A workforce plan needs roles and capability, not just headcount. Operators, supervisors, traffic personnel, specialist contractors and emergency roles have different functions. One person cannot be assumed to cover simultaneous duties that require their undivided attention or presence in different places. Check availability, appropriate training and licensing where applicable, supervision and communication.

Plant planning should identify the actual configuration and constraints, including attachments, supporting ground, access, environmental controls and maintenance. A larger machine may change the whole work system. A smaller machine may extend exposure duration or require different access.

Preparing a loading area includes establishing its layout, controls and release evidence before use. A clear-looking area does not, by itself, meet that completion condition.

Length, area, volume and mass

A length is measured in metres, an area in square metres and a volume in cubic metres. Mass is commonly recorded in kilograms or tonnes. These quantities answer different questions. Converting between volume and mass requires a density, and the basis of that density must be stated.

Suppose a rectangular material quantity measures nine metres by four metres and is one hundred and fifty millimetres thick. Convert the thickness to zero point one five metres before multiplying. Nine times four is thirty-six square metres. Thirty-six times zero point one five gives five point four cubic metres of solid material.

Now assume, only for this example, a density of two point three tonnes per cubic metre. Five point four multiplied by two point three gives an estimated mass of twelve point four two tonnes. The density is an assumption for the calculation, not a verified property of the material. Reinforcement, openings, moisture, mixed material and measurement uncertainty could change a real estimate. The calculation does not establish lifting mass or structural loading permission.

Loose waste volume is another quantity. Suppose a hypothetical loose-volume allowance were twenty-five per cent above the solid volume. Five point four multiplied by one point two five would then give six point seven five cubic metres. The assumed factor must be checked for the actual material and handling conditions; it is not universal.

Record dimensions, units, deductions and assumptions beside the result. A precise decimal does not make an uncertain input precise. Preserve the estimate's intended use, such as preliminary transport planning, so it is not later mistaken for verified engineering information.

A production rate needs a defined time basis

A rate expresses output per unit of time. Duration can be estimated by dividing the quantity by the applicable rate, but only when their units and conditions agree. A rate based on productive operating time is not the same as a rate averaged across a whole paid shift.

Suppose a hypothetical planning quantity is one hundred and twenty tonnes and an assumed rate is twenty-four tonnes per productive hour. Dividing one hundred and twenty by twenty-four gives five productive hours. If the planning assumption is that productive time occupies two-thirds of the elapsed work period, five divided by two-thirds gives seven point five elapsed hours. The rate and productive-time proportion are assumed values; actual work requires evidence for both.

The remaining time might include planned checks, setup, movement, breaks or waiting, but the estimate must explain what it includes. Do not add the same allowance twice by using a whole-shift rate and then applying another productivity reduction for delays already included in that rate. Conversely, do not omit essential controls because a rate came from uninterrupted machine operation.

Test sensitivity rather than presenting one number as a promise. If the assumed productive rate were twenty tonnes per hour, the same quantity would require six productive hours. That comparison shows the schedule's dependence on the rate. The real estimate needs evidence from comparable conditions, actual constraints and reviewed methods.

Separate forecast from actual performance. Record the conditions behind an observed rate before applying it elsewhere. A short easy period, a different material or a more open site may not represent the remaining work. Production pressure cannot justify exceeding equipment limits or skipping release points to recover the original estimate.

Transport capacity and bottlenecks

Production depends on a chain: work creates material, handling moves it, storage holds it temporarily, transport removes it and a facility receives it. Increasing one link's capacity may achieve little if another remains constrained. A bottleneck is the part currently limiting the flow of the system.

In a hypothetical logistics calculation, a vehicle has an assumed planning payload of eighteen tonnes. Its complete cycle is eighty minutes, including loading, travel, receiving and return. With three hundred and sixty minutes available, dividing by eighty gives four point five cycles. Only four full cycles fit within that assumed window, giving seventy-two tonnes. The fractional cycle is not a completed delivery. Real legal payload, axle limits, material acceptance and route conditions need separate verification.

Two such vehicles suggest one hundred and forty-four tonnes only if loading, access, receiving capacity and timing can support both without conflict. They may instead queue at the same loading point. Adding vehicles can increase congestion and public exposure without increasing output.

Suppose the project expects more material than can leave in the available window. Through the reviewed arrangement, the plan must address production timing, lawful receiving capacity or suitable storage. Do not assume debris can simply accumulate anywhere. Storage has structural, environmental, fire, access and separation constraints.

A useful resource review therefore compares capacities on a common time and quantity basis, identifies the limiting link and tests changes across the whole system. Capacity calculations remain subject to verified payloads, transport constraints, storage limits and lawful receiving arrangements.

Schedule dependencies, critical path and float

A schedule connects activities through dependencies and resource availability. An activity's predecessor influences its timing through a specified dependency. With a finish-to-start link, the following activity waits until the predecessor has finished. The critical path is the chain that governs the forecast completion under the schedule's current logic. Float is the available delay before an activity affects a specified later milestone, within that same logic.

Suppose two planning activities can proceed independently. Information collection takes three days and its review takes two more days. A separate logistics arrangement takes four days and can proceed independently. A one-day coordination review starts only after both streams finish. The information stream takes five days, the logistics stream four, and the final review produces a six-day forecast overall.

Reducing the logistics stream from four days to three does not shorten that forecast because the five-day information stream still governs the join. Reducing the information stream may help only if the required work can genuinely be completed sooner without weakening its review. The six-day result depends on the two streams being independent and on the final review taking one day.

Resource constraints can change the logic. If the same specialist must perform both streams, they may not be independent. Access, weather windows, notification periods and facility hours can impose further calendar restrictions. A visually attractive programme can conceal these constraints unless they are stated.

Keep hold points as real dependencies, with evidence and release responsibility. Do not schedule the next activity on the assumption that a review will pass automatically. A short look-ahead plan should identify which upcoming tasks still lack people, plant, information or permission. This allows the issue to be resolved before it becomes pressure at the workface.

Baselines, actual records and revised forecasts

A baseline records the agreed planning picture at a point in time. A forecast updates the expected outcome using current information. Actual records describe what occurred. Keeping these separate allows the team to understand changes instead of rewriting history until the original assumptions disappear.

A useful progress record includes completed quantities, their measurement basis, conditions, delays, outstanding controls and the remaining work. Percentage complete alone can hide a difficult interface or a critical review still outstanding. Compare like with like: tonnes received are not the same as cubic metres estimated, and hours booked are not the same as productive operating hours.

When a variance appears, investigate the cause. It may involve different material, restricted access, equipment reliability, missing information, receiving delays or an unrealistic original allowance. The response should address the cause within the approved work arrangements. More workers, longer hours or larger plant can introduce fatigue, congestion and new technical assumptions rather than solve the constraint.

Contingency is an allowance for uncertainty, not spare time that automatically belongs to production. State what uncertainty it addresses and review it as information improves. Welfare, breaks, maintenance, monitoring and emergency role coverage remain resource requirements, not optional deductions from an optimistic programme.