The phrase 'firm criterion' is correct and usable in written English.
You can use it when referring to a standard of judgment that is unambiguous and precise. For example, "The professor insisted on a firm criterion for evaluating the students' essays."
"It's a very high standard," she said, and the federal bankruptcy code does not set out firm criteria to determine when subordination is appropriate.
Intelligibility varies so much with the speaker and the hearer, however, that it is difficult to formulate firm criteria on that basis.
This direct approach, although time-intensive, allowed us to identify the ethnic origins of the firms and whether they fitted the family firm criteria (two or more family members own and/or work in the business).
Many unit managers claimed to have a verbal PS drug policy, but there were no firm criteria on patient selection (particularly with regards to fasting for PS), monitoring or discharge criteria.
This suggests that better guidelines and firm criteria may be needed to properly diagnose and grade gastric atrophy.
We demonstrated that interobserver agreement for gastric mucosa atrophy was moderate in experienced endoscopists, suggesting that better guidelines and firm criteria may be needed to properly diagnose and grade gastric atrophy.
The chromosomal translocation t(11 22)(q24 q12) is an additional firm diagnostic criterion.
In early 2008, the firm published criteria for ways to securitize a life settlements portfolio so that the risks were minimized.
Gazprom has said it will shed 100,000 jobs, a quarter of its workforce; and in May it was obliged to commit itself to firm performance criteria.
According to the research firm's criteria, which evaluated each service's technology, business strategy, and market size by customer base and revenue, the leading three providers in the country are currently Alibaba (which recently made a $1 billion investment in Aliyun, its cloud unit), Amazon Web Services, and Microsoft.
