At times, there are situations where the projects are prone to specification and design changes in midstream. This model is very useful in such situations as it gives customer greater flexibility in terms of developing the project specification on an ongoing basis and modifying the specifications based on the changing market needs. The project cost is a function of the project execution time and the corresponding resources deployed in this effort based pricing model.
Time accounted and effort based – flexible to suite your taste

Time & Materials or Effort based model
Suitable for projects that require:
Specialised skill sets
Evolving projects
Situations where client want to have greater control on the overall project
Adaptable to onsite as well as offshore needs
Availability for development of a hybrid model