Hello, and welcome to Wikipedia. I noticed your question at Traditional Chinese Medicine. The answer to your question involves things in these policies, guidelines, and essays, which is a lot to read, but you might try just reading the opening sections in each one. - WP:RS, WP:MEDRS, WP:V, WP:NPOV, WP:Article creep, WP:WFTE, or WP:AGF. PPdd (talk) 03:02, 8 March 2011 (UTC)