Title	Diagrammatic Formalism for Complex Systems: More than One Way to Eventize a Railcar System
Author	Sabah Al-Fedaghi
Citation	Vol. 21  No. 2  pp. 130-141
Keywords	Conceptual modeling; system development process; static model; dynamic model; behavioral model

Title	Modeling in System Engineering: Conceptual Time Representation
Author	Sabah Al-Fedaghi
Citation	Vol. 21  No. 3  pp. 153-164
Keywords	Conceptual modeling, time representation, software engineering, systems engineering, static model, dynamic model, behavioral model

Title	Model Multiplicity (UML) Versus Model Singularity in System Requirements and Design
Author	Sabah Al-Fedaghi
Citation	Vol. 21  No. 4  pp. 103-114
Keywords	Requirements elicitation; conceptual modeling; model multiplicity; model singularity; static model; dynamic model; behavioral model

Title	Simulation Study for a UV Water Disinfection Unit Powered by a Photovoltaic System
Author	Sa?d Riahi, Abdelkader Mami, and Viorel M?nzu
Citation	Vol. 22  No. 1  pp. 175-182
Keywords	dynamic model, converters, photovoltaic system, simulation, UV disinfection system.