Because of today’s rapid lifestyle, it is hard to imagine life without information systems in any segment of human activity. The development of information systems is a very complex and time-consuming task. During their development, various methods and tools are used to design and build a functional system. Software engineering helps us in choosing between the various methodologies, which goal is to select the best methods and tools with which we will be able to make a better and high quality software, to suit user requirements. Building an information system, be it a traditional or a modern approach, takes place at certain phases of development. UML is one of the most popular (object-oriented) modeling approach, with which we can model projects from the very beginning (analysis phase) to the implementation of the system. Agile information systems development emerged from the need to speed up the time-consuming process of software development and in order to avoid (unnecessary) documentation. With the appearance of new and modern information systems, there is also the new engineering approach for developing applications called Web Engineering, which is specific in that it uses the Web as a development platform and as a user platform. Due to the increased need for the development of Web applications, new Web modeling languages have appeared, of which the most prominent are WebML and his successor IFML.