The Adult Back Pain and Body Posture Assessment Instrument (BackPDE-Y), whose validity and reliability is planned, will be applied. This assessment scale will be translated into Turkish by two native Turkish speakers, one who is fluent in English.

220 people aged between 20-65 are planned to be included in the study. The data obtained from the study will be analyzed with appropriate statistical methods.

In addition, a previously valid and reliable Musculoskeletal System Health Inquiry (MIS-SS) questionnaire, which evaluates the musculoskeletal problems of individuals included in the Study, will be applied. It will be evaluated whether the results of the data obtained from the Back Pain and Body Posture Assessment Instrument for Adults (BackPDE-Y), which we have validated in Turkish, and the results of the data obtained from the Musculoskeletal Health Questionnaire (CIS-SS) questionnaire are consistent with each other.

Inclusion Criteria:

18-65 years old Willingness to participate in the study The mother tongue is Turkish, Being able to read and write, - It is between the ages of 18-65.

Exclusion Criteria:

Those with a known or concomitant diagnosis of dementia Not wanting to participate in the study Patients with psychotic disorders, depression with psychotic symptoms, bipolar depression Having a psychiatric illness with a serious psychiatric illness that may prevent the individual from understanding and completing the questionnaire

According to the power analysis, the number of samples was calculated to be at least 10 times the number of items in the scale. 220 people aged between 18-65 will be included in the study.