Effort estimation (Aufwandschu00E4tzung) for WDA

Hi,
is there any best practice out there how we can calculate a effort estimation for a the development of a WDA application? Any Excel-Tool, anything?
I thought about calculating for every screen (if it contains for example 3 tabstrips i would calculate alltogeather 4 screens) and add some time for the component. But this is by far too vaguely, isn't it?
How do you do this usually?
Thanks in advance.

Hi Axel,
the time one needs for developing a Web Dynpro ABAP Application mainly depends on the answers to the following questions:
Are there good enough APIs that can be used for handling most of the business logic required?
How flexible should the application be? Do you need to generate the ui or is it sufficient to have fixed screens?
Can components be used again?
--> Ask your developers, not excel
~Silke

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