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Slide Presentation of the 2007 Annual Meeting of AHRQ

The Concept of Slack

Tight coupling and high complexity (versus loose coupling and low complexity) are more accident prone.
- Perrow, 1984, Normal Accidents
Also known as "slack", i.e., usual procedures work less well when there is less slack in the system, because the system loses its resilience to additional interruptions.
- Rudolph and Repenning, 2002

Tight coupling refers to highly interdependent processes (I think)