The life cycle of a structure consists of a sequence of typical stages: conceptual design, final design, construction, maintenance, repair and eventual replacement. Decisions regarding durability of the structure made at one stage have certain implications in the following stages. Each stage may involve different people, therefore decision aids should be able to service different users: owners, specifiers, designers, and builders. The objective of this project is to develop computer-based decision aids which will assist specifiers, designers, and builders to satisfy durability requirements of a wood structure during its life cycle.