Some of you might know that the whole reason we started this project was Radu's interest in the Cognitive Bias Codex (read why we started BrainyTab).

We love the Cognitive Bias Codex and we believe it did an incredible job at making the general public aware of cognitive biases. We have since learned more about it and we learned that it is not perfect. Some experts told us that the categories are not as well defined as they could be; others said that some concepts listed aren't even cognitive biases. To be quite honest, we don't feel that we're the right people to fix it (if indeed it needs fixing) so that's not what this post is about.

As we were gathering definitions for the Cognitive Bias category of BrainyTab, we came across some that we never heard about. It got us thinking about how some biases are a lot more popular than others and about a way to visualise the popularity of each bias. Because we don't have access to all the academic documentation required to measure citations and popularity, we decided to look at the number of Google search results for each bias. We'll explain the rough methodology we used at the bottom of this article; spoiler: it's not perfect.

Initially, we wanted to have all the biases included in one chart because we thought that would be a nice way to visualise the data. That proved to be a bad idea because we ended up with a massive blob of dots that were impossible to interpret.

So we split it into 5 separate charts: the first one shows the main categories (e.g. Need to Act Fast, Not Enough Meaning, etc). The following 4 charts show each of the groups separately.

We also wanted to build the chart at scale and we hoped that we'll get somewhere where a bias with 100 search results will be 100x larger than a bias with 1 search result. Sadly that didn't work perfectly because of how the chart builder works but let us know on Twitter if you'd like to see that and we'll spend some more time thinking about how we can achieve that. Maybe we'll create a poster where 1 pixel equals 1 search result; if we do build that, we'll make it available to download.

How to use the charts: