To understand the event "My feet are tired.  I have been standing up all day.", it is important to know that Logical Connection between factors listed in Database, and creating a new list of factors, fields (applications) costs and benefits analysis, and ranking them with respect to desirable/ undesirable course of action, priority with respect to economic factors, physiological impact on body, its short term, medium term and long term implication,s on relationships ( standing while singing National Anthem- and reaction of friends, society, Law, and the audience around you, if you decide not to stand as you 'havebeen standing up all day'.