As shown in Fig. 1, the activity is regarded as a longerterm
process, which is used to achieve a corresponding
motive (i.e., want to search some information about program
languages). The action is regarded as a shorter-term
process, which is used to achieve a corresponding goal
(i.e., a step from inputting a set of keywords to the end of
checking the corresponding search results). And the current
moment status is regarded as an indicator to describe
conditions at the moment (i.e., reading a search result, page
up or page down).