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s_r_constantin's profile
Sarah Constantin
Sarah Constantin
Sarah Constantin
@s_r_constantin

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Sarah Constantin

@s_r_constantin

Math/ML/data-science person now working on solving aging...and helping with COVID19?! Founder, LRI and Daphnia Labs. Married to @oscredwin

Be
srconstantin.posthaven.com
Joined February 2019

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    1. Sarah Constantin‏ @s_r_constantin May 5
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      is there a keyword for "line by line going through a process and trying to evaluate which steps can be cut without damaging the outcome?" is there a science of this?

      18 replies 3 retweets 18 likes
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    2. Sarah Constantin‏ @s_r_constantin May 5
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      if it's a cooking recipe, you just try skipping a step and observe if it ruins the dish. for more expensive or risky projects, you sometimes can't actually run that experiment. ("what happens if you skip this safety step at the nuclear reactor?")

      2 replies 0 retweets 4 likes
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    3. Sarah Constantin‏ @s_r_constantin May 5
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      but even nuclear reactor designers need to control costs. so I wonder how they streamline things. Asking the relevant experts "ok so what happens if we don't do this step? with what probability?"

      1 reply 0 retweets 1 like
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    4. Andrew Clough‏ @aclough May 5
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      Replying to @s_r_constantin

      I'm sure nuclear reactor designers need to control costs, but do they have a way to control costs in practice? The decline of the nuclear industry suggests they might not.

      1 reply 0 retweets 0 likes
    5. ЬᏂ​au​ϮᏂ‏ @peroxycarbonate May 5
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      Replying to @aclough @s_r_constantin

      The fact that similar nuclear reactor designs got more expensive over time implies to me that the problem is project management rather than design. (And it's not like railroad "designers" are responsible for cost overruns for the California HSR project.)

      1 reply 0 retweets 3 likes
    6. ЬᏂ​au​ϮᏂ‏ @peroxycarbonate May 5
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      Replying to @peroxycarbonate @aclough @s_r_constantin

      And the fact that nuclear reactors got more expensive across several countries at a similar rate implies to me that this issue with project management is something that exists internationally in business.

      1 reply 0 retweets 0 likes
    7. ЬᏂ​au​ϮᏂ‏ @peroxycarbonate May 5
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      Replying to @peroxycarbonate @aclough @s_r_constantin

      If you look at "what goes wrong" in project management, it's usually: - make a contract -> something needs to be changed -> this stalls or wastes work while changes are discussed -> the lawyers take over -> then it maybe goes to court

      1 reply 0 retweets 1 like
    8. ЬᏂ​au​ϮᏂ‏ @peroxycarbonate May 5
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      Replying to @peroxycarbonate @aclough @s_r_constantin

      When you look at under-budget on-schedule projects, often you find a good project manager and more fixed-price fixed-scope contracts than usual. But other PMs using fixed-price contracts makes things *worse* because their predictions of needs aren't good enough.

      1 reply 0 retweets 1 like
    9. ЬᏂ​au​ϮᏂ‏ @peroxycarbonate May 5
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      Replying to @peroxycarbonate @aclough @s_r_constantin

      I think a lot of the problem comes down to modern "international-American" business culture having become *worse* at hiring and perhaps incentivizing project managers.

      1 reply 0 retweets 2 likes
      Sarah Constantin‏ @s_r_constantin May 5
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      Replying to @peroxycarbonate @aclough

      why would this happen?

      12:09 PM - 5 May 2020
      2 replies 0 retweets 0 likes
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        2. ЬᏂ​au​ϮᏂ‏ @peroxycarbonate May 5
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          Replying to @s_r_constantin @aclough

          I don't think you can make a simple global explanation of that kind of dynamic system evolution; it might be better to look at case studies, eg Boeing:https://www.theatlantic.com/ideas/archive/2019/11/how-boeing-lost-its-bearings/602188/ …

          1 reply 0 retweets 1 like
        3. ЬᏂ​au​ϮᏂ‏ @peroxycarbonate May 5
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          Replying to @peroxycarbonate @s_r_constantin @aclough

          But also...why not? Why do you assume people have incentives to hire good project managers? Why do you assume that interview processes work if people do care? etc etc There isn't a competitive market in most places, and economics' assumptions are often invalid.

          2 replies 0 retweets 1 like
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        2. Basil Marte‏ @BasilMarte May 5
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          Replying to @s_r_constantin @peroxycarbonate @aclough

          @alon_levy has a theory: https://pedestrianobservations.com/2020/03/16/who-do-you-learn-from/ … "Certain governance features that seem relevant to construction costs, like the privatization of state planning [to consultants]" "...nor do the managers have any social relationships with their peers abroad."

          2 replies 0 retweets 2 likes
        3. Basil Marte‏ @BasilMarte May 5
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          Replying to @BasilMarte @s_r_constantin and

          I would add the hypothesis that planning-by-consultants is important because it breaks normal learning; it's a special case of "the cost of innovation". Development works by a design department making iterations, and getting feedback on manufacturability, usability, maintenance.

          1 reply 0 retweets 2 likes
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