Pricing Mechanics
Scope Creep
The uncontrolled expansion of project deliverables beyond the originally agreed scope, typically without corresponding adjustments to budget or timeline.
Definition
Scope creep is the single largest margin killer in agency and consulting engagements. It occurs when clients request incremental changes, additional features, or "small tweaks" that individually seem reasonable but cumulatively erode project profitability.
The mechanics are predictable: an agency agrees to a fixed-price project based on an initial scope. As work progresses, the client requests clarifications, additions, or refinements. Because each request appears small in isolation, the agency absorbs the work to preserve the relationship. By project end, actual effort exceeds estimated effort by 30-70%, wiping out any margin.
Scope creep is not a client problem. It is a pricing architecture problem. Fixed-price contracts without explicit change-order protocols create structural incentives for scope expansion. The fix is not stricter enforcement, but different pricing mechanics: value-based pricing with clear deliverable definitions, retainers with capped scope, or hybrid models that separate baseline work from variable effort.
In Bayesian pricing models, scope creep risk is quantified as a probability distribution over final effort. Projects with high scope-creep probability require either higher prices, contractual guardrails, or a different engagement model entirely.
Related terms
Bayesian Pricing
A pricing methodology that uses Bayesian inference to estimate win probability and optimal price points based on prior data and ongoing negotiation signals.
Win-Rate Paradox
The counterintuitive finding that increasing win rates often correlates with decreasing profitability, because high win rates typically indicate underpricing.
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