1. A method for determining the present status of at least one occupancy of one or more individuals based on one or more occupancy data sources, comprising: obtaining the at least one occupancy of said one or more individuals from said one or more sources; computing a score of said at least one occupancy by a computer processor based on the currency and the relative trustworthiness of said one or more sources; and determining said present status of said at least one occupancy based on said computed score.