Within Ron Edwards' GNS theory, movement from one GNS mode to another during the course of play, which involves changing or ignoring of the game and rules as written. It can be relatively simple, as in the case of Abashed design. However, it is distinct from Transition which is change GNS mode using rules which are designed for that purpose.

References:

• GNS and Other Matters of Role-playing Theory
• Simulationism: The Right to Dream