Project Management 101
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Weston & Sampson · AEC LEAD
Weston & Sampson
Project Management · Module 1 · Week 1 Reference

Module 1 · Week 1 · Interactive companion

The Economic Model

Move the figures below and watch a project fee become net service revenue, a pursuit become a weighted opportunity value, and that value enter the firm's forecast.

The basic modelEvaluate a pursuitBuild the forecast

Part 1 · The basic economic model

From project fee to profit

A project fee is the amount a client pays. Weston & Sampson does not keep the entire fee. Part of it passes through to others before the firm earns anything with its own labor.

Direct expenses are subconsultant fees the firm passes through to another firm. Reimbursable expenses are out-of-pocket costs, such as travel and permit fees, billed through to the client at cost. Subtract both from gross revenue and the remainder is net service revenue, the revenue Weston & Sampson earns with its own labor. Net service revenue funds direct labor, overhead, and profit at the same time, not in sequence.

Gross Revenue − Direct Expenses − Reimbursable Expenses = Net Service Revenue

Direct expenses and reimbursable expenses are not present on every project. When they are present, these are the only subtractions the firm makes before it measures its own labor.

Project fee
Direct expenses
Reimbursable expenses
Net service revenue

Net service revenue funds three things at once

Direct labor
The wage cost of the billable work itself.
Overhead
Indirect labor and other operating expenses.
Profit
The amount that remains after labor and overhead are paid.

This split uses Weston & Sampson's confirmed ratios, a direct labor multiplier of 3.25 and an overhead factor of 1.60. Profit is the amount left over, close to the firm's 20 percent target. The project manager monitors these assumptions and acts when scope, effort, staffing, schedule, or risk changes.

Part 2 · Evaluate the pursuit

Before the fee is won, it is a pursuit

Estimated NET Revenue is the same kind of figure as net service revenue, recorded before the project is won. The project manager also records a win probability, an estimate of how likely the firm is to convert this pursuit into signed work.

Estimated NET Revenue × Win Probability = Weighted Opportunity Value
Estimated NET Revenue (carried from Part 1)

A higher win probability should reflect stronger evidence, not a preference for the pursuit to succeed.

Estimated NET Revenue
Win probability
Weighted opportunity value

The weighted opportunity value is the amount of future net service revenue the firm can reasonably plan against before the pursuit is won. It is a planning input, not committed revenue.

Part 3 · Build the forecast

One pursuit joins the firm's planning view

The firm adds weighted opportunity value to its signed backlog, the net service revenue already under contract. The combined figure is the planning view of future work, the basis for a staffing and capacity discussion.

Signed Backlog + Weighted Opportunity Value = Planning View of Future Work
Planning view of future work

This figure supports a staffing and capacity discussion. It remains a planning input, not committed revenue, until the pursuit is won.

Quick check

Test the model

Answer each question to reveal the explanation.

Answered 0 of 3.

Keep this open while you work

Formula reference

Net Service Revenue
Gross Revenue − Direct Expenses − Reimbursable Expenses
Direct Labor Multiplier
Net Service Revenue ÷ Direct Labor (confirmed value 3.25)
Overhead Factor
Overhead ÷ Direct Labor (confirmed value 1.60)
Weighted Opportunity Value
Estimated NET Revenue × Win Probability
Planning View of Future Work
Signed Backlog + Weighted Opportunity Value

Financial figures current as of July 2026. Confirm current values with Weston & Sampson before pricing or planning.