Any mechanical, paper or electronic aid that collects data from an individual patient to generate output that aids clinical decisions during the doctor-patient encounter. Examples include decision support systems, paper or computer reminders and checklists, which are potentially useful tools in public health informatics, as well as other branches of health informatics.
Liu JLY, Wyatt JC, Altman DG. Exploring the definition and scope of clinical decision tools: focus on the problem, not the solution. Working paper, Centre for Statistics in Medicine, Oxford University, 2002.