In their recent article in Psychological Services, Duncan and Sparks (2020) criticize our meta-analysis on the Partners for Change Outcome Management System (PCOMS; Østergård, Randa, & Hougaard, 2020) and judge it to be misleading and flawed.  We argue that the use of the PCOMS Outcome Rating Scale might inflate effect sizes because of social desirability.  Therefore, independent outcome measurement is necessary for a stringent evaluation of the PCOMS as a routine outcome monitoring system. 
PCOMS
We argue that the use of the PCOMS Outcome Rating Scale might inflate effect sizes because of social desirability. 
PCOMS Outcome Rating Scale