1. A method of service management comprising: (a) providing a radiative sensor positioned to observe an area of interest; (b) electronically acquiring from the radiative sensor at least one frame of data of the area of interest; (c) electronically processing said acquired frame of data to determine the presence or absence of at least one object in the area of interest; (d) based on the presence or absence of the object in the area of interest determined in step (c), electronically causing (1) an alert to be generated in response to also electronically detecting a state of the at least one object in the area of interest; (2) an alert to be generated in response to also electronically detecting a state of another object in another area of interest; (3) a timer to initiate or terminate counting a period of time in response to also electronically detecting the same state or a different state associated with the at least one object; and/or (4) data to be stored.