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User Info

When used as directed and in conjunction with other related test, C-ADDS shines with remarkable diagnostic capabilities.

Purpose of Test

  1. For the diagnostic screening of a child’s level of concentration, attention focus, selective auditory attention, and impulsivity;
  2. To assist in the determination of eligibility for receiving special instruction;
  3. To guide in the development of IEP goals and services;
  4. To guide teachers with respect to instructional approaches, modes of instruction, and classroom management procedures.

User Qualification

In general, test users should have an understanding of basic measurement principles and of the limitation of test interpretation. C-ADDS was designed to be administered and scored by para-professionals after a brief training. However, the ultimate responsibility for its use and interpretation should be assumed by a professional with training in psychological testing. If the instrument is to be used for eligibility for social security benefits or other state funds, then the test user should have advanced training in psychological training and the methodological issues in evaluating children with handicapping conditions.

To help ensure that test users have the professional background to administer and interpret the test appropriately, potential users are required to complete a “user qualification form” before purchasing the test from PACERS, Inc. Before using this instrument, potential users should become familiar with the theoretical rationale, development, standardization, psychometric properties, and specific limitations of this instrument as detailed/outlined in the test manual.

In addition, users should be prepared to make clinical judgments about the validity of the results by supplementing test data with information from prior history, teachers, classroom observation, parents, and related specialized psychological tests. Potential users should become familiar with and conform to the standards for the use of test prescribed by the American Psychological Association (1985).

Ethical and Legal Issues

Test users should pay careful attention to the following:
  • Confidentiality
  • Informed consent
  • Safeguard the confidentiality of the test and results
  • Restrict their use to those with a professional “need to know.”
  • Communication to parents should focus on interpretation of results and their implications rather than reporting specific scores.


CADDS was designed to be used with other diagnostic methods such as case history, clinical observation, and direct assessment of the child. It is important that individual student observations take place in a variety of structured and unstructured settings. When used alone, C-ADDS is intended solely as a diagnostic screening device to identify young children in need for further diagnostic evaluation or to provide information on the child’s progress. Results from this test may also be used to guide teachers with respect to alternative forms of instructional methodologies and/or modes of instruction which would bring about maximum results in these at-risk children.

Although the instrument is easily administered and scored and may be used by trained professionals, the responsibility for its use and interpretation should be assumed by a medical doctor or by an individual who is trained in psychological testing.

Specific limitations of C - ADDS:

C-ADDS has a number of specific limitations:
  1. Standardization procedures were conducted on subjects from within a narrow geographical location,
  2. Testing in a “sterile” environment is required for best results, and
  3. Over-learned responses to specific task on the test may present false positives and a child’s resistance to testing (reluctant client) may present false negatives.