Compare Engagement Models
Choose an engagement model by matching scope certainty, delivery ownership, priority change and commercial control to the work. Dedicated teams support continuing roadmaps; staff augmentation adds people to client-led delivery; project based development assigns a bounded outcome to Renvric. Fixed price and time and materials describe different commercial treatments and can sit within a project structure.
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Comparison matrix
| Model | Best fit | Day to day lead | Change | Commercial basis |
|---|---|---|---|---|
| Dedicated team | Continuing roadmap | Shared or Renvric led | Backlog reprioritisation | Agreed team capacity |
| Staff augmentation | Specific client team gaps | Client | Client backlog | Role time or allocation |
| Project based | Bounded outcome | Renvric | Project change control | Fixed phased or T and M |
| Fixed price | Stable defined deliverable | Renvric | Formal baseline change | Agreed deliverable price |
| Time and materials | Evolving or uncertain work | Agreed in governance | Routine reprioritisation | Approved time or capacity |
How the choices relate
Dedicated team, staff augmentation and project based development describe how responsibility and team structure are organised. Fixed price and time and materials describe how work is paid for and how commercial change is handled. A project based engagement can therefore be fixed price or time and materials, while a dedicated team is commonly funded by agreed capacity.
Decision guide
Start with ownership
If the client will direct daily work and retain delivery accountability, consider staff augmentation. If Renvric should own a bounded outcome, consider project based development.
Test scope certainty
Stable, testable deliverables may support fixed price. Material unknowns or an evolving roadmap usually favour time and materials or staged discovery.
Consider continuity
A continuing roadmap and need for retained knowledge may justify a dedicated team.
Define control
Agree backlog authority, acceptance, spend visibility, forecast cadence and the mechanism for material changes.
Plan transition
Specify how the engagement can scale, change model, complete or hand over without losing knowledge.
Responsibility by model
Staff augmentation places the strongest day-to-day responsibility with the client. A dedicated team often shares product and delivery governance, with the exact split documented. Project based development places delivery leadership with Renvric for the contracted outcome. In every case the client retains decisions and obligations that cannot be delegated, including authorised access and business acceptance unless the contract states otherwise.
Commercial and change controls
Fixed price requires a stable baseline, assumptions and acceptance. Time and materials requires transparent rates or capacity, regular forecasting and spend controls. Both require change decisions: fixed price changes the contractual baseline, while time and materials changes backlog, capacity, budget or forecast within agreed authority.
Use staged commitments when evidence is limited
A buyer does not need to select one model for the entire lifecycle. A fixed discovery can reduce uncertainty, a time and materials stage can prove difficult integrations, and a later project can commit to a better-defined release. Each transition should have a decision owner, evidence threshold, commercial closeout and updated responsibility map.
Questions for procurement and delivery leaders
What specific result or capacity is being purchased?
Who controls priorities and daily work?
Which dependencies and client inputs affect the commitment?
How will acceptance, quality and security be verified?
What evidence supports an estimate or forecast?
How can the team scale, transition or exit?
Which terms vary by country, currency or contracting entity?
Common questions
Can we change engagement model later?
Yes. Define a transition decision, commercial closeout, responsibilities, knowledge transfer and the new governance rather than changing only the label.
Which model is best for an MVP?
It depends on uncertainty and ownership. Discovery plus a small project, time and materials team or fixed release can each work when their assumptions fit.
Can fixed price include change?
Yes, through a documented change process that updates price, time, scope or another part of the baseline.
Is staff augmentation cheaper than a dedicated team?
Cost depends on roles, duration, management, location, risk and terms. Compare total responsibility and operating effort, not rates alone.
How should we evaluate proposals?
Compare assumptions, included responsibilities, team, controls, evidence, acceptance, transition and total cost in addition to the headline price.
Related pages
Share the outcome, scope certainty, current team, decision structure, timing, budget context and procurement requirements. Renvric can recommend a model and identify the assumptions that need validation before commitment.