This paper provides a research model to analyze how decisions relating to the choice of modeling approach are made in the context of software engineering and how behavioral variables account for the intention and actual use associated with conceptual modeling frameworks. Modeling approach refers to the part of system development that involves investigating the problems and requirements of the users community and from that, developing a specification of the desired system. To that extent the choice of the conceptual modeling approach is a function of the methodology adopted for the entire software development lifecycle. We consider two broad classes of methodologies – the process-oriented approach (also known as the structured approach) and the object-oriented approach. We formalize the question whether there is a difference between object-oriented and structured approaches when it comes to requirements modeling. Secondly, we study decisions processes regarding the adoption of either an object-oriented, structured or combination approaches.