prescriptive
🇺🇸
/prɪˈskrɪptɪv/
🇬🇧
/prɪˈskrɪptɪv/
giving rules or instructions
The teacher used prescriptive methods to guide the students.
dictating how something should be done
Some language experts prefer a descriptive approach over a prescriptive grammar.
established by long use or tradition
The company's prescriptive policies have been in place for decades.