Inclusion Criteria:  Participant is willing and able to give informed consent for participation in the study and complete questionnaires in the local language. Aged 18 years or above. Diagnosed with PsA according to the ClASification of Psoriatic ARthritis (CASPAR) criteria and diagnosis confirmed by a rheumatologist (Taylor 2006).  Exclusion Criteria:  Patients who don't speak or read the local language Patients who are not comfortable filling in an app-based questionnaire or paper CRF. Patients with a new diagnosis of PsA at the current clinic visit