Violence and agression occur frequently at admission wards. In the last 20 years a vast body of literature was developped showing the effect of risk assessment, ward environment, personell, law and many other factors determining ward policy contribute to the reduction of coercion. In the workshop we wil present the main prinicples of a tool, which is currently used at all wards throughout the country. The registration tool argus covers all coercive measures in a way the subsitution of one measure by another can be investigated. Date of time of strart and end contribute to a precise cacluation of the time patients are subject to any form of coercion. In the workshop we present the main caculation techniques. We show how to tap into hospital registration systems. We also show how the data of these systems are included in a relational database allowing a standardised calculation of coercion use.