![](https://evilhat.com/wp-content/uploads/2022/06/3pillars.png)
Not sure I buy into this, but a mention on twitter of WOTC’s 3 pillers of RPG (Exploration, Roleplaying and Combat) popped it into my mind. (EDIT: Dave rightly points out that Wizards views these as the three pillars of D&D, a subtle but important distinction)