: Measurements must be taken on different fields of view. Repeatedly counting the same micrograph is not permitted by the standard.
: A transparent grid with equally spaced points is superimposed over a specimen image (micrograph or viewing screen). Points falling within the phase of interest are counted across multiple fields to achieve statistical significance. The Point Counting Procedure astm e56219 pdf
: A point landing completely within the phase of interest counts as 1 . : Measurements must be taken on different fields of view