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zone focusing:

A series of ten zones (or tones) from 0 (black) to 9 (white) with 5 being middle gray and reflecting 18% of the light. Each zone reflects double or half of the light (1 Stop) of the adjacent one. Specific subject tones can be placed in predetermined zones that best suit a particular subject, contrast range, and stylistic intent. Developed by Ansel Adams, the system is widely taught and is detailed in books by Minor White and others.

tiffaneduglossary

zone focusing:

A way to focus that utilizes the depth of field scale rather than the actual distance from camera to subject. Zone focusing is most useful for candid, street photography.
ritzcamera

zone focusing:

A method introduced by photographer Ansel Adams for determining optimal exposure and appropriatedevelopment for an individual photograph.
Photo Tips

zone focusing:

An exposure calculating system based upon previsualizing the scene as a set of tonal variations, and exposing and developing to maximum that tonal set.
ritzcamera

zone focusing:

A system designed to bridge the gap between sensitometry and creative photography. It was developed byAnsel Adams and Fred Archer in 1939-40. It relied on empirical testing by the photographer of film and paper to provide information about the characteristics of the materials to support the photographer in definingthe relationship between the way a subject was visualized and the end result.
visualartcork

zone focusing:

An exposure method developed by photographer Ansel Adams for determining optimal exposure and development for each negative.
guidtofilmphotography