Fixed price
Fixed-price work fits a stable scope with objective acceptance criteria. It transfers some estimate risk to the provider, but it can also create pressure to treat every clarification as a change request. Use it when uncertainty is low.
Time and materials
You pay for actual effort. This works well when priorities will evolve, provided the buyer reviews progress frequently and has visibility into who is doing the work.
Dedicated team
A recurring team provides continuity and deeper product knowledge. It requires stronger management from the buyer because capacity can be wasted if priorities are unclear.
Staff augmentation
Individual specialists join the buyer’s existing engineering or operations process. This works best when the buyer already has technical leadership, repositories, planning and review practices.
Managed service
The provider owns a defined operational outcome, often with service levels. This can reduce day-to-day management but requires careful definitions of scope, measurement, escalation and change.
Outcome-based arrangements
AI-assisted delivery is pushing some suppliers toward pricing based on measurable outcomes rather than hours or headcount. These models can align incentives, but only when both sides can define and measure the outcome without creating perverse incentives.
| Model | Best when | Buyer must be strong at |
|---|---|---|
| Fixed price | Scope is stable | Specification and acceptance |
| Time & materials | Priorities evolve | Backlog and review |
| Dedicated team | Longer roadmap | Product ownership |
| Staff augmentation | Existing team needs capacity | Technical leadership |
| Managed service | Process/output is measurable | SLA and governance |
Hybrid models are common
A buyer may use staff augmentation for product engineering, a managed service for support and fixed-price work for a one-time migration. The relationship does not need one model across every function. Match governance to the uncertainty and business impact of each workstream.
Revisit the model as the work matures
A prototype may begin as time-and-materials work and later move to a dedicated team once the roadmap is stable. Operational processes can move toward service levels after the exception patterns are understood.
Do not let the contract model replace management
No pricing structure fixes weak requirements or slow decisions. Fixed price still needs acceptance criteria; dedicated teams still need priorities; managed services still need meaningful service levels. Choose the model that makes uncertainty visible, then manage it actively.