The purpose of this paper is to explain the concept of Information Architecture (IA) in the context of the Preponderant Realities Model and to demonstrate its relevance to the Information Systems Planning activity, which is emphasized to have a complex nature and deep contingency, requiring a holistic approach that evaluates casuistically the relevance of a set of realities, among them the IA. This model is part of the PRAXIS framework. A review of the literature focusing on IA is also conducted, incorporating current developments in the field of Information Systems and related scientific areas associated with the management of organizations. It is also concluded that the recent literature continues to confirm the systemic and holistic nature, and the contingency of the PSI activity that MRP underlines.