(a) (b) (c) (d) (e) (f) de principper, der ligger til grund for revisionen af NABS; problemerne i forbindelse med NABS 1983; begrænsningerne ved revision af NABS; behovene hos dem, der bruger data; tilgængeligheden af data i medlemsstaterne; udviklinger i internationale organisationer.
This paper looks in general at: the principles to underlie the revision of the NABS; the problems associated with NABS '83; the constraints on revising NABS; the needs of the users of data; the availability of data in Member States; developments in international organisation.