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Stewart Butterfield: evaluation

20 Nov 2025 Lenny's Podcast Slack founder: Mental models for building products people love ft. Stewart Butterfield

“I think in many cases, people will add a feature, it's not good enough and so people don't use it or appreciate it, but now you've added some complexity to the app and then people give up or take it back or they try something in testing and they don't get the results they want, and so they decide that this a thing is worth doing.”

— Stewart Butterfield

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Speaker
Stewart Butterfield
Attribution
Verified speaker
Claim type
evaluation
Recorded
20 Nov 2025
Publisher
Lenny's Podcast

Transcript context

…To prep for this chat, I talked to so many people that have worked with you over the years to try to figure out what you taught them about building product, building teams, building companies that most stuck with them, that most helped them build amazing products. The first is a concept called utility curves. This came up a bunch across so many people that have worked with you. Talk about what is a utility curve, how you use that to build better products. This is pretty easy because it's a very familiar S-curve where you have, it's flat and it starts arcing up and then there's a really steep part and then it levels off again. And on the horizontal axis, you can think of cost or effort and on the vertical axis, it's value or convenience. It depends exactly what you're talking about, but the idea is the first bit of effort you put into something doesn't result in a huge amount of value. And then there's some magic threshold where it produces an enormous amount of value and then continued investment doesn't really pay off. The most basic example I can think of is let's say you're making a hammer, and on that bottom axis, it's now quality, and if the hammer has a handle that breaks with any impact, then is totally useless. And if you make it a little bit stronger, it's still pretty useless and it's like junk, junk, junk, junk, junk. Okay, good, great. Then it doesn't matter anymore. If you're making an app, okay, this app's going to have users and so let's make a user's table and a database, and so far you have generated no value. The reason I felt like this was so important is because we would talk about a feature, and usually features are thought of as a binary. You either have this feature or you don't. The argument I guess was have we just not invested enough in this or have we got all the value or convenience or quality or whatever that we could get out of this? And we had pointed diminishing returns and it just doesn't matter. I think in many cases, people will add a feature, it's not good enough and so people don't use it or appreciate it, but now you've added some complexity to the app and then people give up or take it back or they try something in testing and they don't get the results they want, and so they decide that this a thing is worth doing. We would try to really investigate and decide whether we were on the first shallow part of the curve, the second shallow part of the curve, or we're just coming up to it. So I think it's a lot easier to understand the value of this when you're talking about a specific app and a specific feature, but I think it was ultimately helpful in getting people to understand whether something was worth it or not. So just to mirror back what I'm hearing, there's this, if you visualize this curve at the bottom, it's like I don't even know what this is. And then up the curve is like, okay, I sort of get it. And then at the top is, okay, I can't live without this now that I understand what this is for, it feels like it's a really a different way of thinking about getting to the aha moment for someone where they see, okay, saved items, I get it, I need to use this constantly. It feels like this works both for a specific feature and also just for Slack, getting people to even understand here's what Slack can do for you. And then now I can't live without Slack. And essentially this is a lens you use to figure out where to spend product resources because if you don't get up that curve to I get it and I can't live without it, nothing else matters. Is that the framework?…

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