He offers two examples of instructional practices that could come into wider use if tests themselves made more rigorous demands. (scientificamerican.com)
An artist needs the best studio instruction, the most rigorous demands, and the toughest criticism in order to tune up his sensibilities. (art-quotes.com)
«We also go through inspections by some of our larger customers who have more rigorous demands,» he adds. (fooddrink-magazine.com)