Solúbtha : A Model for Designing Flexible Business Transactions of Purchase Order Management Processes A.K.M. Rafiqul Haque M. Sc. in Computer Science B. Sc. in Computer Science A thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy Supervised by Dr. Ita Richardson Dr. Eoin Whelan Professor dr. Micheal P. Papazoglou Professor dr. Willem-jan van den Heuvel Dr. Yehia Taher Submitted to the UNIVERSITY of LIMERICK, June 2014