A CCR is a resource that may prevent the system moving closer towards its goal.  A CCR may not be a bottleneck but all CCRs usually need to be taken into account when producing a schedule.

(http://www.toc.co.uk/glossary.htm)

Other Definitions

Capacity Constrained Resource (CCR) – Not necessarily a bottleneck, but a resource that may become a bottleneck if it is not carefully managed .(http://www.tocpractitioner.com/tocglossary.asp)

J. Jerrald Hayes
I am ex-architectural woodworker and general contractor turned IT, Business and Project Management consultant, software developer wannabe senior division triathlete and ski racer, Yankee fan and founder of Paradigm-360.com, 360 Difference Mac4Construction.com,iOS4Construction.com and now TheBuildingAndRemodelingWiki.com too.
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