Item-person map.

Abstract

<p>(A) volition; (B) planning; (C) purposive action; and (D) effective performance. The numbers after the decimal point for each item indicate the step difficulty. In a 3-point scale (0–2), for example, “diet control. 1” represents the first step difficulty (between response categories 0 and 1) of the “diet control” item and “diet control. 2” represents the second step difficulty (between response categories 1 and 2).</p