Wireframing is the stage where high-level mock-ups (lo-fi) are created on the basis of concepts. They are not intended to present a graphical user interface, only information architecture, and functional design, i.e., how the product will meet users' goals. During wireframing, we develop solutions on how global elements, such as header, navigation, footer, modal windows, etc. should behave. A well-made wireframing should cover all the functional assumptions of the product developed in the strategy phase so that the UI can be designed without any problems on the basis of the wireframes. Creating high-level mockups also saves time when visualizing various troubleshooting suggestions. In a short time, it is possible to prepare different versions of mock-ups of the same elements of the page or application.