According to activity theory, humans are driven by goals to perform required actions. Being information processing entities, they are able to ascertain a set of goals which become needs, and thus lead to humans having attraction towards certain objects. Activity theory offers a set of perspectives on human activity and a set of concepts for describing that activity. The main aim of activity theory is to understand the reasons behind an action, and describes these reasons, rather than predict them. (http://www.ics.uci.edu/~corps/phaseii/nardi-ch1.pdf)
A method using activity theory to provide expert reviews for human-computer interactive devices has been created, which is called the Activity Walkthrough. The tasks to be done are first identified. The activities of the users are then oriented to the tasks the system can perform. The tasks the system can perform are verified to see their usefulness. Next, each task is broken down into specific low-level steps. The tasks are then carried out unless they are irrelevant. Finally, the data is gathered and reviewed critically. More on this method can be found in this literature review: http://delivery.acm.org/10.1145/1030000/1028052/p251-bertelsen.pdf?ip=137.132.250.14&CFID=41023923&CFTOKEN=63499383&__acm__=1315374265_ec50c1ecb079abe586c7aa8145a25edb
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