"This system naturally lends itself to a pipeline approach, which the product manager organizes." Whoever came up with "the pipeline approach", or thought it w

"This system naturally lends itself to a pipeline approach, which the product manager organizes." Whoever came up with "the pipeline approach", or thought it would be a good idea, had never actually worked on any part of a project before. The reason the pipeline approach fails is because the people with the most knowledge about what is possible are at the end of the pipeline, and for some reason they are kept there. The implementers need to be learning the process they are implementing, before a spec is even written. I bet the majority of everyone's career has been spent being told to implement impossible requirements, or admitting that the requirements aren't actually impossible and having to say that the company doesn't actually have the time or the money to implement it (which is the logical definition of impossible, if not the physical definition).