Recently, new Information Systems are being introduced to users on regular basis. At a certain point, users might deal with several systems producing overwhelming amount of information and resources. This is challenging on many levels, as the user has to look for information and resources in different Information Systems. One of the most important challenges here is the way to manage the resources produced from those systems. Another important one is to produce knowledge from these resources and provide support for decision making process. This also applies to complex systems such as System of Information Systems (SoIS). Thus, we aim to investigate resources management and decision support in a System of Information Systems (SoIS). We plan to address this issue by introducing an architectural model of SoIS. This model will provide guidance to build a first prototype. The SoIS operates as a single entry point for several Information Systems granting the user access to information and resources produced from multiple Information Systems. It also provide the ability to track users' activities to create an added value not possible to maintain when those systems were operating separately. Furthermore, this encompassing solution is possible by introducing a knowledge base as a leader system to the orchestration of SoIS. This knowledge base can take the role for storing, organizing, and sharing resources from different Information Systems. Thus, provide the link between resources present in different systems and facilitate resources management and decision making in a System of Information Systems.