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Abstract.A ventilator system provides respiratory support to critically ill patients in the Intensive Care Unit. Increasing complexity in the user interface, features and functionalities of ventilator systems can cause medical errors and cost the life of a patient. Therefore, the usability of ventilator systems is most crucial to ensure patient safety. We have evolved a specialized set of heuristics combined with objectively defined usability indicators for the usability evaluation of touch screen based ventilator systems. Our study presents the heuristic evaluation of three touch screen based ventilator systems manufactured by three different companies. The heuristic evaluation has been performed by four different usability evaluators to ensure the reliability of heuristics proposed in this paper. The specialized set of heuristics linked with user interface components and the objectively defined usability indicators are found more reliable in identifying specific usability problems of ventilator systems.

UEM examine humancomputer interaction (HCI) to identify aspects that can be improved to increase usability at a particular stage of system development. ANSI/AAMI SW87:2012To order call +1-877-249-8226 or visit http://my.aami.org/store

Refrigerators are used to store food items mainly in food carriers such as plastic boxes, trays or bags. This research paper is focused on Contextual Inquiry (CI) of refrigerators and related contextual design of egg tray. To understand user perspectives about refrigerators, food items, food carriers and related problems, a CI is conducted with 19 home users from 12 households. The CI has provided vital insights into several major aspects of refrigerators, their usage and user interaction. For example, the maximum weight of a food item stored in refrigerator is about 2 Kg. The selected food carrier for implementation is an egg tray. Such intelligent tray is a specially designed food carrier using a load cell for sensing a weight of eggs stored on it. Thus, a contextual design of egg tray helps in providing information about number of eggs stored on a egg tray. In future, this research work will be extended to other food carriers and related mobile App.