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spec: Swimming and water exercise are especially good for people with arthritis . The five main categories of images are : historical images , commercial images , news , sports and entertainment , portraiture , and editorial . Topic categories for proposals include : institutionalization and sustainability ; disciplinary linkages ; practice linkages ; curricular content ; and external forces . It is always interesting to see people 's reaction to the project and to remember that unless you go into the building every day like I do , it 's hard to get your bearings when you do go inside . Haven said both felt comfortable talking to the " common man " and both men ' s words helped the country deal with crises . With sources of timber in other parts of the world nearing exhaustion , logging companies have turned to the central African forest as '' the last forest frontier `` . The transition to a mandatory regime will have the advantage of building on experience both from a relatively unique interim Procedure , in which countries are implementing the Convention prior to its entry into force , and from voluntary regimes that predate the Convention . 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 .