The T&M model works best for customers who want a flexible and agile project execution.This model works best when requirements change frequently and are generally used for product/application development projects.
The fixed price model is perfect projects, where requirements, specifications, and schedules can be clearly defined before the testing starts for your product/application. If client cares more about the result and not the means in would be achieved with, this model is more than appropriate.
Crowdsourced testing model best, where products/applications to be tested on a large number of platforms and devices to ensure they are bug-free and ready to go live. Azuro Technology uses the free pool of experienced test engineers to work in this model on demand basis.