Abstract: A database for use by a plurality of user groups, the database including: designation means for designating data into one of the following sets, a general set for data of potential general applicability to all user groups, the data within the general set being customizable only by one or more system administrators, and a specific set for each individual user group for data of potential applicability to only that user group, the data within the specific set being customizable only by the user group, whereby the information as presented to any selected user group is the result of aggregation of the data from the general set and the specific set for the selected group. Preferably the sets into which the designation means is capable of designating data further includes one or more intermediate sets for data of potential applicability to one or more sub-sets of user groups respectively.