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propensive's profile
Jon Pretty
Jon Pretty
Jon Pretty
@propensive

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Jon Pretty

@propensive

Supporting Scala through professional training and open-source software. Responsible for Magnolia, Fury, Scala World and Functional Africa.

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propensive.com
Joined July 2010

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    1. Jon Pretty‏ @propensive 16 Apr 2019

      Jon Pretty Retweeted Erik Bernhardsson

      I'm glad @fulhack wrote this clear analysis about estimating software projects. It maybe needs another explanation about why the mean and median completion time for software development tasks are so different, so here's my take. (1/4)https://twitter.com/fulhack/status/1117968632536010754 …

      Jon Pretty added,

      Erik Bernhardsson @fulhack
      Why software projects take longer than you think – a statistical model https://erikbern.com/2019/04/15/why-software-projects-take-longer-than-you-think-a-statistical-model.html … (blog post)
      2 replies 10 retweets 24 likes
      Show this thread
    2. Jon Pretty‏ @propensive 16 Apr 2019

      Unlike almost any other production task or industry, software development seeks solutions which are, at their most basic, repeatable; at best, highly abstract and general. One solution can be reused thousands or billions of times for almost zero cost. (2/4)

      1 reply 1 retweet 5 likes
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    3. Jon Pretty‏ @propensive 16 Apr 2019

      All the tasks which can be completed using known solutions, no matter how large they seem, will be competed quickly. So what's left after that? It might be a small part of the total, but it will need new solutions, working things out for the first time; all the unknowns. (3/4)

      1 reply 1 retweet 5 likes
      Show this thread
    4. Jon Pretty‏ @propensive 16 Apr 2019

      So that's where almost all the time is spent: tasks that you've never solved before. And how do you estimate them, when you have no data? It's at best a guess. (4/4)

      4 replies 3 retweets 20 likes
      Show this thread
    5. Cons Dubai‏ @dxbcons68 16 Apr 2019
      Replying to @propensive

      So 10% of the project original schedule will take 90% of the actual time, there is some old joke about that

      1 reply 0 retweets 0 likes
      Jon Pretty‏ @propensive 16 Apr 2019
      Replying to @dxbcons68

      Yes. You can pick your n% and (100 - n)% as necessary.

      2:47 AM - 16 Apr 2019
      0 replies 0 retweets 0 likes

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