A method for associating a characterization attribute with a document in a computerized system is disclosed, the method comprising providing a primary insertion of a document associating at least one intrinsic characterization attribute with the document, and providing a secondary insertion of the document associating at least one extrinsic characterization attribute with the document. A method for changing the level of details of a document representation in accordance with a magnification of the document representation is also disclosed. A machine readable medium containing machine executable instructions providing a method for building a multi-user document vector is also disclosed, the method comprising a first plurality of documents associated with a first user, a second plurality of documents associated with a second user and a multi-user document vector comprising the first plurality of documents and the second plurality of documents.