Brand integrity is a fragile thing, so it needs to be
treated as such. Brand guidelines are, in essence,
your owner’s manual on how to “use” your brand. These
guidelines will be referenced by everyone who touches
your brand, internally or externally, and will often
be partially reused in future brand identity
revisions.
Because of that, it’s important that you define enough
of the guidelines to keep your brand consistent, but
keep them short enough that contributors can actually
digest all of the rules.