[word=categories] [tag=IN] [□] □ □
[word=categories] [tag=IN] [□=□] □ □
[word=categories] [tag=IN] [!□] □ □
Some of the broad categories of participants are : Policy makers ; Library and information science professionals ; Information technology professionals ; Archivists ; Content and knowledge managers ; IT service providers ; Information providers and vendors ; Museologists ; Electronic publishing and virtual electronic communities ; and Stakeholders in the digitization and knowledge business . For this thesis , two categories of tasks were identified for implementation ( see Future Work for a discussion on adding tasks and categories of tasks ) : Navigation , and object manipulation . Topic categories for proposals include : institutionalization and sustainability ; disciplinary linkages ; practice linkages ; curricular content ; and external forces . The five main categories of images are : historical images , commercial images , news , sports and entertainment , portraiture , and editorial .