How to use · Planning & decisions

Change an assumption. See what it means for your decision.

Case background

A professional services business is considering a $120k project requiring 100 person-days. Cost is $800 per person-day plus $12k of external services. Contribution excludes fixed overhead and taxes.

CaiGeek

Is this $120k project worthwhile if it needs 100 person-days?

CaiGeek

At the stated costs, the project contributes $28k. Extra effort reduces that margin, so also consider team capacity and payment timing.

Project quote$120k
Project contribution$28kAt 100 person-days

One project, different assumptions

Contribution
$120k · 100 days2.8 / 3.2$28k
$120k · 120 days1.2 / 3.2$12k
$140k · 120 days3.2 / 3.2$32k

Cost: $800 per person-day plus $12k external services. Fixed overhead and taxes excluded. Quote and effort are scenario assumptions; actual delivery needs follow-up.

Start with the decision you are considering. Explore its assumptions in a model, then ask how they affect cash and delivery.

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