param contain contain uml user compon param valu valu properti set properti uml user contain contain valu object stimulu contain target stimulu old valu properti contain equal valu old valu valu equal old valu aren realli rare ident pointer valu old valu object valu object action model facad dispatch action stimulu model core helper set action valu rupdat diagram set stimulu todo explain realli work mdr linu sceptic dummi str model facad stimulu model core helper set stimulu dummi str 