The information needed to build a data model is gathered during the requirments analysis. Although not formally considered part of the data modeling stage by some. methodologies, in reality the requirements analysis and the ER diagramming part of the. data model are done at the same time.
These documents are authoritative and time-tested consensus agreements. Use of the standard AIA documents provides the building owner, the architects and the contractors with a comprehensive and cohesive set of documents for a particular project.
ICAO Annex 15 specifies that aeronautical information should be published as an integrated aeronautical information package (IAIP), composed of the following elements: 1  The Aeronautical Information Publication (AIP), including amendment services. 2  AIP supplements. 3  Aeronautical Information Circulars (AIC).