Purpose: To investigate the effects of a fully functional electronic patient record (EPR) system on clinicians' work during team conferences, ward rounds, and nursing handovers. Method: In collaboration with clinicians an EPR system was configured for a stroke unit and in trial use for five days, 24 hours a day. During the trial period the EPR system was used by all clinicians at the stroke unit and it replaced all paper records. The EPR system simulated a fully integrated clinical process EPR where the clinicians experienced the system as if all transactions were IT supported. Such systems are not to be expected to be in operational use in Denmark until at least two years from now. The EPR system was evaluated with respect to its effects on clinicians' mental workload, overview, and need for exchanging information. Effects were measured by comparing the use of electronic records with the use of paper records prior to the trial period. The data comprise measurements from 11 ...