"Stringent measures" refers to strict actions or rules that are put in place to make sure something is done precisely or to ensure high standards are followed. Full definition
A more stringent measure of liquidity compared with the current ratio. (hsbc.ca)
Our certification requires us to pass stringent measures in medicine and client service — and continue to uphold those qualities throughout the year. (walnutcreekvets.com)
However, the theft rate is increasing even after the state has taken stringent measures to curb it. (blog.agentinsure.com)