When your development strategy is well-defined, i.e., when the development plan has a fixed timeline, and budget, as well as the features of the app are pre-decided. When everything is precisely clear, it becomes easy draft an estimate followed by time-bound execution.
Fixed Timeline
Suitable for projects which have defined timeframe and is bound to be completed accordingly.
Fixed Budget
Suitable for projects which are budget-constrained and allow effective use of resources.
Pre-defined Features of the App
Based on the given details, an estimate on time, budget, and resources can be prepared anc achieved accordingly.