The purpose of this research is to analyze the implementation and the use of IS (information system) by micro-firms. Organizational bricolage approach is particularly relevant to treat this question. This theoretical framework provides a new perspective for IS literature. For this research, we focus on IS management to explore this field. Indeed, micro-firms are characterized by simple IS and low formalization. The owner-managers develop intuitive strategies based on subjective decisions. In order to better understand the modalities of bricolage in IS by micro-firms, we realized 64 semi-directive interviews with French owner-managers. Results show a distinction in the implementation process and the use of the IS.