The challenge for sound designers of control programs is to enable carefree interaction so that the users do not need to worry about missing sound alarms.

Avi Harel is a mathematician with thirty years of expertise in user interface design and development. Avi is the inventor of ErgoLight patents and award-winning software tools for incorporating human factors in system design (http://ergolightsw.com/CHI/Company/ Articles.html). Avi is the founder and active manager of ErgoLight Ltd. (http://ergolight-sw.com).