New functions have been integrated in the Giessen Hospital Information System WING to support the classification of all intensive care patients into the Therapeutic Intervention Scoring System TISS. The use of those functions has been pushed by legal requirements which made it essential to assess the staffing of intensive care wards in comparison with the accumulated TISS scores. This paper describes the experiences made within two years of TISS scoring. We think that TISS gave a major impact to the construction and implementation of nursing documentation into our HIS.