ADHD is one of the most common referrals to school psychologists and child mental health providers. Although a best practice assessment of ADHD requires more than the use of rating scales, rating scales are one of the primary components in the assessment of ADHD. Therefore, the goal of this paper is to provide the reader with a critical and comparative evaluation of the five most commonly used, narrow-band, published rating scales for the assessment of ADHD. Reviews were conducted in four main areas: content and use, standardization sample and norms, scores and interpretation, and psychometric properties. It was concluded the rating scales with the strongest standardization samples and evidence for reliability and validity are the ADDES, the ADHD-IV, and the CRS-R. In determining which of these to use, the prospective users may want to reflect on their goals for the assessment. The ACTeRS and the ADHDT are not recommended for use because they are lacking crucial information in their manuals and have less well-documented evidence of reliability and validity. Conclusions and recommendations for scale usage are discussed. © 2003 Wiley Periodicals, Inc.Assessment of ADHD is an activity that all school and child-focused psychologists will be involved in during their practice. Given the high incidence of the disorder, approximately 3-5% of the childhood population (APA, 1994), ADHD is one of the most common referrals to school psychologists and child mental health providers (DuPaul & Stoner, 1994). Thus, school and child psychologists are faced with the decision of choosing appropriate methods and measures to provide a thorough, appropriate assessment for ADHD. Although a best practice assessment of ADHD requires more than the use of rating scales, rating scales are one of the primary components to the assessment of ADHD due to the normative data they provide (Barkley, 1998;Brock, 1997;Burcham & DeMers, 1995, Landau & Burcham, 1996.There are a large number of rating scales available for the assessment of ADHD. These scales have been developed for teachers, parents, children and youths, in addition to others familiar with the child (e.g., psychologists). Each of the available rating scales has unique characteristics and possesses different strengths and weaknesses. In a critique of the use of behavior rating scales for ADHD, Reid and Maag (1994) recommended that because many ADHD rating scales are psychometrically questionable, practitioners should scrutinize each measure's psychometrics and norms. This can be a time-consuming task. Therefore, the goal of this paper is to provide the reader with an easy reference to a critical and comparative evaluation of the most commonly used, narrow-band, published rating scales for the assessment of ADHD. This information is presently lacking in the literature. Although Edelbrock and Rancurello (1985) presented a general overview of several rating scales for hyperactivity, this information is no longer current nor did they offer a critical evaluation of the measures. It is hoped th...