The aim of this study is to present a contribution in the area of human decision modeling. A state of the art from this research area shows the lack of models combining perceptive and cognitive aspects in simulation perspective, with naturalistic paradigm of modeling. Our study is based on naturalistic approaches of human behaviors simulation to evaluate possible usages of artifact propositions. It implies an exhaustive affordances modeling (environmental, sociologic and physiologic). We present our current work on a simulator named SIHMM which emulates a virtual user, who is guided by goals, in a complex environment. His mental model is born with wish of mixing perceptive and cognition aspects of human decision to respect naturalistic approach. This work assumes real experimentations, which will be explained in a stakeholder of this article. This article will have done with a presentation of a demonstrative tool, developed in perspectives of HCI prototyping. KEYWORDS Naturalistic app...