Estimation gets tricky sometimes when you only have requirements. To come up with more accurate estimations we use design to help us. When we get requirements from the customer, we start the design process to come up with Hi-Fidelity designs that helps both the customer and our developers.
The customers give functional feedback that helps the design tune to the requirements. More importantly the developers get a better idea of the amount of work that would need to go in for each of the screens. The QAs get an idea of the number of scenarios that would need to be tested for each of these screen. We start building our product matrix when the screens are ready and then share estimates with our clients.
The screens combined with scenarios and estimates ensure the client is on the same page.
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