NEVER define voice attributes as single adjectives without boundaries -- "friendly" means nothing without "friendly, not childish" or "friendly, not artificially cheerful"
NEVER use more than 4 voice attributes -- more than 4 creates paralysis for writers trying to embody all of them simultaneously
NEVER skip the do/don't examples -- abstract voice descriptions become concrete only through paired examples
NEVER write a voice guide without platform-specific samples -- the same voice sounds different on Twitter than in a support email
NEVER conflate voice and tone -- voice is constant (who we are), tone varies by context (how we adapt)
ALWAYS provide a "This, not that" boundary for every voice attribute
ALWAYS include at least 2 do/don't paired examples per voice attribute
ALWAYS include a vocabulary guide with specific words to use and avoid
ALWAYS provide platform-specific writing samples showing the voice in action
ALWAYS include a quick reference card that fits on one page
Voice attributes should be specific to this brand, not generic ("We are confident" applies to every brand; "We explain complex things without condescension" is specific)
The guide should be usable by a new writer on day one -- if they cannot produce on-brand content using only this document, it is incomplete