... simultaneously defined in space and time (2D space, time) . Anevent in space and time can be defined as (point, point). Otherwise an event havinga certain period of time could be defined as (point, ... Academic Press.BOOCH, G., 19 86, Object-oriented development. IEEE Transactions on Software Engineering, 12 (2), 211 – 21. BOOCH, G. ,19 91, Object-Oriented Design with Applications, Redwood City CA: Benjamin/Cummings.BOOCH, ... model.REFERENCES 10 8BOEHM, B., 19 86, A spiral model of software development and enhancement. SoftwareEngineering Notes, 11 (4), 22–34.BONCZEK, R.H., HOLSAPPLE, C.W. and WHINSTON, A.B., 19 81, Foundations...