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0 pointsjudofyr5y ago0 comments

And thanks for replying!

> It is correct that is can still be seen as migrating to a better form of estimation.

Well, from my perspective there is still estimation going here: A project manager came to you asking for a timeline for a feature and you replied with a concrete number of days. I don't think it makes any difference to the project manager whether you call it an "estimate" or "prediction".

> For me personally, I went from estimations are just really poor even for the most simple things and not worth the effort.

The example you're presenting isn't showing this because it doesn't seem like you made any actual effort estimating it. It would have been better if you showed that you spent hours talking with various people for input and then in the end the Cycle Lead was more precise. In this example you did an estimate without even talking to the team! (Yes, you talked to the team leader, but apparently they didn't know that there was performance issues with enabling the flag so there's some communication lacking here.)

If you wanted to properly estimate it you would at least (1) ask in the stand-up if there was any concerns about flipping the flag and (2) communicate with the release manager to see that it would have been possible to do a release. And it looks like if you actually did this then you would end up with an estimate that is closer to the actual time. It might also have uncovered that there was another release process happening at the same time.

Considering that the standard deviation is two weeks (!) it seems more that you were lucky in this example that there wasn't more unplanned work. What if the performance issue required three days of work instead of one? What if the release manager told you that they were upgrading database servers and couldn't do a release for two days?

> Yes, it was done with just the team lead and me. We migrated away from Scrum at that point and we did not do full team refinement with estimations sessions pre-sprint.

There's a middle way between "full team refinement with estimation" and "only team leader and me estimates". You can ask around and double check before giving out estimates to project managers.

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eternalban5y ago

The approach OP described was new for me. What I got from the article was that a statistical tool allows for fairly accurate estimates without the need to "[spend] hours talking with various people for input". Further, it is not a certainty that an elaborate exploration of the proposed changes with various stakeholders will address potential blindspots or simply unexpected events (e.g. some infra burning). If OP is corrent, the statistical estimate has all these factors baked into it and will only get better over time.

This is the value of the approach, imo. Takes the 'subjective' element out of the picture. [p.s. And also, it 'scales' with project size, likely O(1). The 'ask everyone involved' approach is at best O(N)'.]

Your point regarding the standard deviation is quite fair but doesn't indicate a failure of the approach: the approach would be broken if they ever exceed the sd, so it is still a nice, definite, limit to the task completion timeline. Also I assume that as more data is gathered, the sd will shrink.

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