Tripod Delta (diagnostic evaluation tool for accident prevention) is a
checklist-based approach to carrying out safety ''health checks.'' Th
is paper describes the theoretical background of the approach, which i
s based on a model for understanding the role of human error in accide
nts. The method for constructing databases from which to make checklis
ts and use of the system to generate remedial safety plans are describ
ed. Finally, the implementation is discussed and the status is reviewe
d.