... (2005) 12 9 16 2mandatory for A1 , A2 and A3 . D2 is mandatory for A2 , and D3 is restricted for A3 . Since D1ismandatory for A1 , the form definition F1 associated with A1 holds a field for D1. However, ... the associations between activity def-initions and data object definitions. As indicated above, D1 is mandatory for A1 , A2 and A3 , D2ismandatory for A2 , while D3 is restricted for A3 . D0 and ... A1 the knowledgeworker may already enter a data value for d2, although this is not required for the completion of A1 . However, A1 cannot complete before d1 is entered (D1 is mandatory for A1 )....