I thought it would to be interesting to discuss the motivations behind No Estimates rather than the argument as to whether they are required or not. The motivations due go some insight into why they are being provided as an option after all. As I see it there seem to be three primary motivations behind No Estimates:
We don’t want to be wrong
IT professionals are first and foremost caring people who honestly don’t want to let people down and have to inform them that they were mistaken. In this case, it is much easier to not have to give them an estimates which we know is probably wrong. No one ever likes to have the meetings where we need to request weeks of additional effort and thousands of additional budget. The business may think that IT doesn’t care as the dollars are not from the IT budget, but IT really does take these overages seriously and hate to make these requests.
We feel that estimating itself is a waste of time and effort
We also have been on projects where estimating has gone horribly wrong and estimates were way too detailed. Excessive time was spent on estimates in the thought that additional analysis would result in more detailed estimates and a better project plan. IT has learned that estimates should be less detailed, but still those memories seem hard to forget.
We feel bad estimates will led to bad projects and poor quality
Finally, we feel that once given, estimates will be imprinted on the clients and everything else will be sacrificed in order to abide by the estimates. Weekends, personal time, quality, documentation, everything will be sacrificed so we can meet the vastly inaccurate estimate provided at the start of the project when we knew so little.
Let us agree
So let us first agree that all these reasons are valid and noble reasons. We may disagree whether Estimates are valid, but I doubt believe there can be any disagreement that the motivations behind the No Estimate movement are true and valid.