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A Phone That Knows Youre Busy Its a modern problem：youre too busy to be disturbed by incessantphone calls so you turn your cellphone off .But if you dont remember to turn it back on when youre less busy.you could miss some important calls if only the phone knew when it was wise to interrupt you，you wouldnt have to turn it off at all. Instead，it could let calls through when you are not too busy A bunch of behavior sensorsand a clever piece of software could do just that，by analyzing your behavior to determine if its a good time to interrupt you.If built into a phone，the system may decide youre too busy and ask the caller to leave a message or ring back later. James Fogarty and Scott Hudson at Camegie Mellon University in Pennsylvania based their system oil tiny microphones，cameras and touch sensors that reveal body language and activity. First they had to study different behaviors to find out which ones stongly predict whether your mind is interrupted The potentialbusynesssignals they focused on included whether the office doors were left open or closed，the time of day，if other people were with the person in question，how close they were to each other, and whether or not the computer was in use. | 
