Which of the following is NOT a method of specifying?

CSI formally recognizes the main methods of specifying as:

Descriptive

Performance

Reference standard

Proprietary

From this list:

Proprietary (B) – A method where specific products, manufacturers, or model numbers are named.

Performance (C) – A method that states the required results or performance rather than prescribing exact materials or methods.

Reference standard (D) – A method that cites published standards (e.g., ASTM, ANSI, UL) to define the requirements.

These three — proprietary, performance, and reference standard — are all recognized CSI methods of specifying.

Option A. “Perspective” is not one of CSI’s methods of specifying. It appears to be a typographical error for “prescriptive,” but CSI generally uses the terms descriptive, performance, reference standard, and proprietary as the main categories. Taken literally as written, “Perspective” is a term related to viewpoint or drawing type, not a spec-writing method, so:

The choice that is NOT a method of specifying is A. Perspective.

(If the intended word were “Prescriptive,” CSI practice would treat “prescriptive/descriptive” specifying as a recognized method, still making the written option “Perspective” the one that is not a valid method.)

CSI-aligned references (no external links):

CSI Construction Specifications Practice Guide – section on Methods of Specifying.

CSI CDT Study materials – descriptions of proprietary, performance, reference standard, and descriptive/prescriptive specifying.