The process of rater training for observational instruments: implications for interrater reliability.

Although the process of rater training is important for establishing interrater reliability of observational instruments, there is little information available in current literature to guide the researcher. In this article, principles and procedures that can be used when rater performance is a critical element of reliability assessment are described. Three phases of the process of rater training are presented: (a) training raters to use the instrument; (b) evaluating rater performance at the end of training; and (c) determining the extent to which rater training is maintained during a reliability study. An example is presented to illustrate how these phases were incorporated in a study to examine the reliability of a measure of patient intensity called the Patient Intensity for Nursing Index (PINI).