It has become obvious that corporate management, administration, planning, cash flow, and other business activities could hardly function without information technology in the organization of society. Relationships between human activities and the people themselves are reliant more and more broadly on electronic devices. In terms of using information technology devices and services, the development of enterprises are significantly different in the European Union. This has led to a strong and significant relationship with the added value created by micro, small-, and medium-sized enterprises. In order to meet the needs of corporations, enterprise resource planning and integrated management systems have evolved and have become more and more widespread among small- and medium-sized enterprises as well. Although Portugal in the group of Southern European countries and Hungary in the group of Eastern European countries lag behind the other countries belonging to their group, it turns out that in terms of using and intending to use business information systems, Portuguese enterprises are more advanced in the categories of small- and medium-sized enterprises. This chapter explores this.