“…For example, some research has addressed the recommendations set forth at the June 1996 Invitational Conference, 24 which included: (1) Developing, explicating, and testing theory about the assumed causal relations between the structure and process variables and the related health outcome variables; [17][18][19][20][21][22][23][25][26][27][28][29] (2) encouraging creative strategies to utilize existing primary and secondary data sets to generate control or comparison groups and to conduct outcomes research; [30][31][32][33][34][35] (3) capitalizing on natural experiments that change structures or processes to test theory about causal or interactive relations among organizational factors and outcomes; (4) increasing expertise in methodological issues unique to organizational research; [36][37][38][39] and (5) refining selected outcome categories. [40][41][42] However, despite the progress made, there is urgent need for further research, especially in view of the dramatic changes in health care delivery and the expanded care provider roles of nurses in a variety of settings.…”