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The Clinical Outcomes in Routine Evaluation Outcome Measure (CORE-OM) is a part of the CORE system. It is one of the most commonly used outcome measures used in the UK

It has 34 items covering:

  • problems
  • well-being
  • functioning
  • risk


Internal reliability is said to be about .94

CORE-OM as screening tool[]

On administration to clinical populations it is usual to find that about 20% of people do not have pre-treatment scores in the clinical case range.(Evans et al 2003). Should these clients be excluded from treatment on the basis of their low scores at initial screening? Terry et al (2007) in a study of 37 low scorers treated in a primary care service found that only three had been inappropriately referred while about half had minimized their symptom reporting on test. They found the particular difficulties of six additional subjects were simply not picked up by the CORE-OM. This suggests that the instrument should not be used routinely as the basis for whether or not to offer therapy.

CORE-OM as outcome measure[]

See also[]

References & Bibliography[]

Key texts[]


Core System Group (1998). CORE System (Information Management) Handbook. Leeds: Core System Group.


  • Barkham, M Margison, E, Leach, C, Lucock, M., Evans, C, Mellor-Clark, J. et al. (2001). Service Profiling and outcome benchmarking using the CORE-OM; Toward practice-based evidence in the psychological therapies, Journal of Consulting and Clinical Psychology 69(2), 184-196
  • Evans, C., Connell, J., Barkham. M., Margison, R, McGrath, G., Mellor-Clark,J. & Audin, K. (2002). Towards a standardised brief outcome measure: Psychometric properties and utility of the CORE-OM. British Journal of Psychiatry. 180, 5l-60.
  • Leach, C., Lucock, M., Barkham, M., Noble, R., Clarke, L. & Iveson, S. (2005) Assessing risk and emotional disturbance using the CORE-OM and HoNOS outcome measures at the interface between primary and secondary mental healthcare. Psychiatric Bulletin, 29, 419-422.
  • Shepherd, M., Evans, C., Ashworth, M., Nairne, K. and Robinson, S.I. (2007)Making CORE-OM data work for you and your service: a primary care psychology and counselling team's experience of routine outcome measurement. Clinical Psychology Forum 174,31-34
  • Terry, R., Shepherd, M., Simmonds, L., & Sperlinger, D (2007)An initial investigation into clients referred to primary care psychology and counselling service with CORE-OM scores falling below the clinical cut-off, Clinical Psychology Forum, 176,10-13

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