 Apart from KO "O", three other shorten Polish versions of the questionnaire – Symptom Checklist "S-I" (KO "S-I"), Symptom Checklist "S-II" (KO "S-II") and Symptom Checklist "S-III" (KO "S-III") – were designed to enable quick diagnosis of neurotic disorders (screening).Both KO "O" and KO "S" were created by a team of researchers led by Jerzy Aleksandrowicz in the Psychotherapeutic Unit of the Psychiatry Department of the Jagiellonian University Medical College in Kraków, Poland.In 2000 in the Department of Psychotherapy of the Jagiellonian University Medical College in Kraków, Poland, KO "O" scales were updated.