Summary: How you contract a software project affects cost, flexibility and risk. Here is when each model makes sense.
Choosing the right engagement model is as important as choosing the right technology.
Fixed price
Best when the scope is clear and unlikely to change. You know the cost in advance, but changes require formal change requests.
Time and materials
Best when requirements will evolve. You pay for the time spent, gaining flexibility to adjust priorities as you learn.
Dedicated team
Best for long-term products. A stable team works only on your product, building deep knowledge over time.
Mixing models
Many projects start with a fixed-price discovery phase, then move to time and materials or a dedicated team for development.
Questions to ask
- How stable is the scope?
- How quickly do we need to adapt?
- Do we want long-term product ownership?
- How will progress be reported?
FAQs
Which model is cheapest?
It depends on scope stability; the wrong model often costs more.
Can we switch models later?
Yes, many clients do once the product matures.
How is quality protected?
Through agreed testing, reviews and acceptance criteria in every model.
