Abstract
Information and communication technology has been introduced rapidly into health-care field, and can contribute to system complexity and new human errors. Nielsen has defined 5 facets of usability: learnability, efficiency, memorability, errors and satisfaction. The more the usability progress, the more likely patient safety will be achieved, however, there is the trade-off relationship between safety ensuring and efficiency seeking. Technology needs to be designed and improved to support real workflow and care processes.
