Under standardised conditions, a comprehensive data set on the current disease status of patients (N = 150) with rheumatoid arthritis (RA) and psoriatic arthritis (PsA) will be collected in D01 in combination with a comprehensive clinical test battery of hand function as well as comparative data from a healthy cohort (N = 75). The parallel acquisition of hand function using state-of-the-art motion capture sensor technology provides a critical basis for the experimental evaluation and integrated data interpretation of the novel sensor data (sub projects A01, A02 and A03) acquired during the acquisition of hand function using EmpkinS.