Finally, Weinstock and Hissam (chapter 9) address a wide range of perceptions and “myths” related to the F/OSS phenomenon, and present data gathered in five case studies: the AllCommerce Web store in a box, the Apache HTTP server, the Enhydra application server, NAIS (a NASAoperated Web site that switched from Oracle to MySQL), and Teardrop (a successful Internet attack affecting both F/OSS and proprietary systems). They conclude that F/OSS is a viable source of components from which to build systems, but such components should not be chosen over other sources simply because the software is free/open source. They caution adopters not to embrace F/OSS blindly, but to carefully measure the real costs and benefits involved.