Systems and methods for managing activities among two or more mobile devices that are collocated include means for determining a set of tasks to be performed collectively by at least a first mobile device comprising a first set of subsystems and a second mobile device comprising a second set of subsystems, while the first and second mobile device are collocated during a period of time in the future; means for assigning a first task of the set of tasks to be performed by the first mobile device based on the first set of subsystems; and means for assigning a second task of the set of tasks to be performed by the second mobile device based on the second set of subsystems. The first and second sets of subsystems are different from one another with regard to at least one subsystem.