2006-11-26 00:57:27Mtk & Lmm
rule of thumb
rule of thumb: A rough and useful principle or method, based on experience rather than precisely accurate measures.
For example, His work with the youth group is largely by rule of thumb. This expression alludes to making rough estimates of measurements by using one’s thumb. (from dictionary.com)
My own research on youth subculutres in Taiwan is conducted by rule of thumb.