Second, proportional growth measures provide useful system - wide instructional signals and allow underperforming schools to seek out high - performing model schools working in similar educational contexts. (educationnext.org)
This simple but useful system works for any age. (mymommymanual.com)
Engineers (in contrast to scientists) need not seek to understand all proteins but only enough to produce useful systems in a reasonable number of attempts. (imm.org)