1. A computer-operated method of analyzing individual activities using a processor that automatically processes received input data, the method comprising: recording observed posture and activities of a subject; characterizing the subject's recorded posture and activities based on a posture observation protocol; storing the characterized posture and activities in a computer data file; using a processor coupled to the computer data file, reconstructing the subject's posture and activities over time based on the computer data file; using the processor, ascertaining based on the reconstructing, the subject's activity/movement volume in the space the subject occupies over time as the subject moves for a certain amount of time; and determining areas in the space that the subject occupied over time from the ascertained volume.