User navigation in a target portal with at least two portal pages. At least one query is created that includes uniform resource locators (URLs) of selected portal pages as search terms in a first search level; repeating until a certain abort criterion is reached: Receiving and analyzing search results of the at least one query including external websites containing search terms as part of their content; selecting a set of uniform resource locators from the received search results; creating a node in a graph-like-model for each selected URL if not already contained in the graph-like-model and associating the node with the selected uniform resource locator; creating and issuing a further search query including selected uniform resource locators of external websites in an additional search level; and in case the certain abort criterion is reached, performing a number of actions.