What this research tells app designers and developers, is that it’s important to know what kinds of other apps are placed around your app, because it can speak to your users’ needs. For example, if users have put your photo editing app next to Instagram or Facebook, maybe you should add “share with…” functionality to your app. (This is a basic example, of course – most photo-editing apps have sharing built-in.)
I’m particularly interested in customers who fall into the first three categories because they’re the most engaged: usage-based, relatedness, or usability-based arrangements. These are the customers where you fight to get your app on their Home screen. For example, I know that Ben Brooks has discussed his usability arrangement on a couple of occasions.
I personally am a mix of usage-based and usability arrangements, and would think there’s significant overlap between these two groups. Also, for some time now, I have not kept folders on my Home screen. About six months ago, I basically eliminated using folders entirely. My Home screen now contains apps I either use regularly or need fast access to (e.g., Maps) while my second screen has all my work apps, etc.