Oil and gas projects, due to their complexity, present a wide range of opportunities and issues that challenge decision-making processes. The major challenge addressed here concerns the coordination of multiple interdependent decisions. To overcome this challenge, we have explored two resolution strategies. The first one is a strategy by synchronous decision about a set of interdependent project decisions, the second one is by deciding one by one (asynchronous decisions). We present here the first strategy, including two similar modeling methods that can be conducted for such strategy: a QFD approach or a morphological approach. Both are followed by a multicriteria analysis. In the first stage, a set of scenarios is generated, then consistency between different decision alternatives is investigated using compatibility matrix. In the second stage, an evaluation and selection of an appropriate scenario is performed. Finally, to illustrate this strategy, an example is presented. This paper concludes that a structured methodology is promising for such contexts and draws some perspectives for asynchronous strategy and for the global strategy choice.