Two of these guidelines deserve some elaboration. Number 6 insists on the importance of labeling all materials so that future users will always know what its constituents are, and therefore what its capabilities and limitations are. By the same token, all buildings should always have record books which detail how the buildings went together and all work done subsequent to original construction. Information is the lifeblood of ecological building and design. Number 8 specifies the use of dry or mechanical connectors (instead of adhesives, caulks, etc.) to facilitate disassembly. The challenge is doing this in a way that does not compromise building performancelike energy efficiency or protection from moisture damage.