| CPC G08B 21/24 (2013.01) [G01G 19/52 (2013.01); G08B 7/06 (2013.01)] | 15 Claims |

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1. A method, comprising:
importing calendar data that includes a sequence of class start times and stop times associated with a class schedule;
automatically measuring with a device a first weight of a set of items in a bag responsive to a first time in the sequence of the class start times;
storing with the device the first weight as a calibrated weight;
following a second time in the sequence of the class stop times and after determining with a force-sensitive resistor of the device that the bag is being worn by a user, automatically measuring with the device a second weight of the set of items;
storing with the device the second weight as a measured weight;
determining with the device whether the measured weight is less than the calibrated weight; and
based on the determination that the measured weight is less than the calibrated weight, notifying with the device, the user that at least one of the set of items is missing.
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