ABSTRACT:The development of a BI project goes through several phases. The analysis phase remains an upstream phase, which requires further investigation to overcome the major problems that arise during this phase and to anticipate the resolution of other problems that may arise in the other phases for the development of these BI projects. The complexity of the formalization of the decision-makers' needs (DN) is one of the problems that has been tried to be solved by proposing a new version of the meta-model of the formalization of informational goals, which have been implemented with models. This new version of the meta-model will facilitate to the analyst-designer the identification of decisional data from a set of decisionmakers' goals, from which the facts' and dimensions' parameter of the star schemas can be extracted. In the remainder of this paper, the first part provides a state of the art of the DN formalization approaches and their models of representation, then the second part presents our new version of the meta-model of the goals' formalization, and, finally, this work is completed with the conclusions and a future work part.

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Decisional information systems (DIS), compared to traditional information systems, constitute today an essential support for decision-making in any enterprises taking into account the complex analysis (discovery requirements and analysis of the sources of data warehouses); to build and develop this DIS, to which many concepts and methods have been proposed. In this article, we made a study about these DIS developments methods; firstly, we presented a state of the art of the most used methods in recent years, Secondly, we made a comparative study based on the framework that was originally proposed for engineering systems and corroborated afterward its efficiency to understand various disciplines such as: engineering methods, engineering information systems, process engineering and requirements engineering.

Abstract-Requirements Engineering (RE) is an important phase in a project of systems development. It helps designanalysts to design and to model the expression of the end-user needs, and their expectations vis-a-vis their future system. This engineering is studying two major issues that are: What should the system do in order to have a complete needs specification, and reason on the why: "Why do we need to build this system? ", without looking for how to build it. The vast majority of needs engineering approaches are based on two concepts: scenario or goal; there are generally three types of approaches: ScenarioOriented Approaches, Goal-Oriented Approaches and approaches generated by the couple: goals and scenarios at the same time. In the remainder of this paper, we present a comparative study of the three types of the RE approaches, then models of needs representation, and finally we conclude with the conclusions.