Strong opinions, weakly held

Monoculture and consensus

In response to my previous post on engineering culture, Bill Higgins asked in the comments:

Recently I worked on a project with multiple sites, and one of our toughest problems was the vast cultural differences between the sites. As a trivial example, one of the sites was militant about test automation and another site barely paid lip service to it.

So it seems like there is some happy medium between “multiple, incompatible cultures” and “monoculture”. I would be interested to hear your thoughts on where cultural homogeneity is helpful and where it is harmful.

It seems to me that the problem here is not diversity but rather failure to reach consensus. One big challenge when it comes to building engineering teams is figuring out which things everyone has to agree on and which things everyone can do their own way. For example, if you’re a Python shop, everyone can use the text editor of their choosing, but everyone has to use spaces or tabs, mixing the two is not an option.

Similarly, test driven development only works if everyone on the team practices it. If you’re not writing tests, it’s really easy to write code that is nearly impossible to test. Similarly, if there’s no continuous integration infrastructure, the people who aren’t writing tests will regularly check in code that breaks the existing tests. Teams have to reach some kind of consensus about these issues with team-wide implications.

To me this is a separate issue from avoiding monoculture. Teams have to reach consensus in order to function well. I read someone who said that in interviews, they look for people who are willing to “disagree and commit” when they can’t reach consensus. Oddly, I find that these situations arise as often on teams with no demographic diversity (read, composed entirely of white guys) as they do on more diverse teams.


  1. Interesting, I think we’re talking about culture in two different ways. When I was talking about culture I basically meant “shared core values” that can be either intangible things like “we really care about the product we’re building” to more tangible things like TDD.

    It seems like when you talk about monoculture, you’re talking about culture in terms of personal heritage – gender, race, nation of origin, etc.

    Do I have this right? If so then I say that both concerns are extremely important but entirely orthogonal.

  2. I think diversity of culture, whether it be human culture, or technological culture, is absolutely critical to success. As Alan Kay so famously remarked “a change in perspective is worth 80 IQ points,” and few things provide new perspective than someone with all sorts of different cultural (of both types) baggage.

    As for tabs v spaces, I see it as “thou shalt not use tabs”, akin to “thou shalt not kill”. Only sociopaths violate that rule. Either of them.

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