Dynamics of modern business creates everyday challenges to all participants of business process when they are making different character decisions, often several times a day. In many cases, some decisions should be made as soon as possible, and the information available for making the right decisions are not always available and sufficient. Information users often have more different sources from which is possible to collect in many different ways all the necessary information. An important role when making business decisions have conditions in which decisions are made, and they are directly or indirectly affecting the choice of information sources as well as making business decisions. Selection criteria for information sources and for evaluation of their quality are different, but all have one common goal- to provide useful and timely information. The use of computers and Internet in modern business, not only as means of communication but as an inexhaustible source of all kinds of information becomes unavoidable. Computerization and internetisation greatly facilitate and accelerate business processes and business in general. One of the fastest, practical and simple ways of modern times for collecting the necessary business information, represents the use of network interface, ie. Internet. The Internet is becoming available to even bigger amount of consumers, both private and business, and Internet access is enabled to the fullest extent to all employees, regardless of hierarchy. In the theoretical part of this thesis are explained and presented frameworks of business decision-making, and current theoretical knowledge about information in business decisionmaking, as well as problems that usually occur in their gathering, and the Internet is presented as an information interface in business decision-making. The research conducted for the purposes of this doctoral thesis has involved 10 companies from metal industry in Međimurje County. It has been examined to which sources and sources characteristics when collecting information is given the highest importance. Research showed as well the distinctive role of the Internet as a source of information for making business decisions considering expectations of the Internet as a source of information, as well as the usability of information obtained on the Internet. It has been determined that there are differences in satisfactions of employees with management, in business success of companies and in the quality of information that production employees receive from management, considering the importance that Internet as a source of information has for making business decisions. Furthermore, differences have been determined in the employee’s satisfaction with management depending on the company in which they are employed. Based on the results of the analysis of data collected with quantitative and qualitative research, effective Decision-making model based on information from the network interface (Model UOMS) has been elaborated. The model proposed process algorithm of successful and efficient business decision-making, based on information gathered from the network interface where the network interface is their primary source.