Abstract: A relational database having a plurality of search terms stored in a computer memory and a graphic user interface (GUI) stored in the same or a different computer memory which can retrieve search terms from the database and is operative to form and display an XY matrix, having an X axis representing historical time and a Y axis representing a plurality of categories of subject matter. The search terms are displayed on the X axis of the matrix in accordance with their respective temporal position in history and on the Y axis of the matrix in accordance with their respective categories of subject matter. The matrix is expandable by the user in both the X axis and Y axis directions to reveal an area of the matrix together with the search terms disposed thereon.