Everyone want to feel secure when preparing larger investments. The prevailing and intuitive path is to have experts analyze and estimate the efforts. Most experts put their time in understanding the solution: what risks are there, what are the gaps to current solution, what technical alternatives should we select and who have the necessary skills.
Instead of spending time analyzing
Working with large backlog items means more hand-overs, higher complexity, scattered delayes and long queues.
More data which is more accurate alows putting more time on evaluation
The principles of Product Development Flow by Donald Reinertsen
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