Situation Metaphor (Contd) 

 Interaction Model 

  In Intearction model we formally define a particular situation as
   
 S¡=S(L¡,T¡,A¡,F¡)  


where


L¡ gives physical location co-ordinates(latitude,Longitude)

T¡ is a continuous period of time with start and end periods

 A¡ is a set of activity points with respect to all activites
engaged in work space 

 F¡ describes the set of contextual factors affecting the
interaction 

 F¡={ f1,f2,f3,.....fm } 

 The relation ship between the situation and entities in given by

 ID(S¡)={ e1,e2,e3,.....en }

 which means that a particular situation is defined by the set of all
 entites that constitute that situation.