Which word in a code describes the mandatory use of certain types of materials, methods or procedures?

Which word in a code describes the mandatory use of certain types of materials, methods or procedures?

• A. Shall
• B. May
• C. Could
• D. Should

Answer: (A)

In codes and standards, the word that marks a binding requirement is “shall.” When the code states that certain materials, methods, or procedures shall be used, it means you are required to follow that rule. It’s a non-negotiable obligation used to ensure safety, compatibility, and quality. The other terms convey different levels of obligation: “may” indicates permission or option; “could” suggests possibility but not a requirement; “should” points to a strong recommendation or guidance, not a must. So, for mandating specific materials or procedures, “shall” is the right choice.