%0 Conference Paper %A Trinh, Thanh Binh %A Truong, Ninh Thuan %A Nguyen, Viet Ha %B KSE: the 2011 International Conference on Knowledge and Systems Engineering %C Vietnam %D 2011 %F SisLab:1768 %P 143-149 %T Refining Undetermined Events for Specifying Concurrent Programs %U https://eprints.uet.vnu.edu.vn/eprints/id/eprint/1768/ %X Development of many system features in a robust specification is a challenge in reactive system design. This paper presents a formal approach for specifying concurrent programs by refining undetermined events in Event-B. This approach investigates the concurrent aspect in specification and provides a general structure of models using Event-B specification. According to this structure, we illustrate the specification of three concurrent mechanisms: critical section access, reader-writer and producer-consumer. It is shown that the concurrent aspects in programming can be specified coherently using Event-B refinement.