Group play vs. Individual play

[higgins]

Ultimately, I think that what you can extract and keep on applying to all sorts of games is the following: the way you define (or let open) the types of relationships between (player) characters has a major impact on play.

But how do explain this importance and distinction in Forge terms? This isn't presented in the big model and looking through the Forge glossary, I didn't spot any relevat terms either.