iserith
Magic Wordsmith
Why does it matter? As I've stated before, I do leveling based on "chapters" or roughly on number of successful encounters. Depends on the group preference and the campaign. But I've been doing it for a few years now, I'm not concerned about the category.
My only goal/logic/method is to level up in a way that makes sense for the story we're telling. For me, that means ignoring XP.
Why does it matter? Because this is a discussion and I'm trying to understand your method better and to see if and how it aligns with established approaches. I'm interested in the topic of advancement systems. It's why I'm in this thread.
Story-based advancement in the DMG doesn't use XP and is based on awarding levels for accomplishing "significant goals." That sounds like what you're doing. I'm interested in how you define "encounters" as well.