The "crtical point test" (aka "scissors test") requires that if any one item fails, nobody should be injured.
A "bend" is a knot that joins two ropes.
A "hitch" is a type of knot that that must be tied around another object.
The "whistle test" requires that if all rescuers let go, nobody should be injured.
Love it or hate it, math is an important part of rescue. Some rescuers enjoy geeking-out on the math, but if math isn't your thing, you can get away with a few key concepts and rules-of-thumb.
These topics are covered on the following pages:
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Wish you were rigging?
You could be.