The phrase "a more rigid system" is correct and usable in written English.
It can be used when discussing systems that require stricter rules or structures compared to others.
Example: "In order to improve efficiency, we need to implement a more rigid system for project management."
Alternatives: "a stricter framework" or "a tougher structure".
Indeed, some argued that the United States ended up with a more rigid system of tracking than any other country.
Slovakia, with a more rigid system, has seen numbers double.The region's nimbler, more market-oriented colleges have been helped by the new practice of dividing education into chunks (bachelor's and master's degrees, for a start), with work sandwiched in between.
This was followed by a more rigid organisation of concepts into more abstract categories or themes.
By the Postclassic, this had been codified into a much more rigid system closely resembling that of Japanese, in which a well-defined syllabary can supplement or even replace logograms.
If you have to continually get back in line to deal with data processing experts on the engineering team, it discourages this kind of experimentation in a much more rigid system.
Once policing became more problematic due to police disappearing from Cairo, the military took over, creating an overall more rigid system and making the military position more critical.
Hence, with the reform a more flexible system was replaced by a more rigid new system.
"It was a more rigid caste system," says Ehrlich, who is a co-founder of Artes Magnus, a company that issues limited-edition objects like Cindy Sherman's Madame de Pompadour-inspired china.
Increasing arterial stiffness leads to a more rigid vascular system and therefore may result in better agreement between methods.
Beginning with more rigid systems (often small carbohydrates in complex with proteins, or glycoproteins with deliberately trimmed glycans), crystallography and NMR spectroscopy added the first few rungs of the technical ladder that leads to more high throughput methods for carbohydrate structure determination.
A large amplitude change was observed in the flexible system 24 with an extended conformation being exchanged for a more rigid "sandwich" form to maximize guest binding.
