Apparatus for analyzing non-deterministic results of a search query of data, comprising a processor and a user interface, the processor being operably in communication with a plurality of data sources and adapted to communicate with the user interface which enables the user to query the content of the data sources, wherein the processor is adapted to determine the probable relevance of at least the part of a searched data source for a user query and the user interface is adapted to present to the user the search results in a form comprising two or more portlets, wherein the portlets comprises two or more of: a portlet presenting the search results (such as search strings) for a data source(s); a portlet presenting the data source (such as by source name) of a data source(s); a portlet presenting a data source filter tree for selecting currently active source(s); a portlet presenting the hit(s) of a search query for a data source; a portlet presenting the hit location within a data source; and at least one of the portlets presents the user with the probability of the relevance of the data source to the search query.