This two-part article offers a thorough introduction to <A HREF="http://www-128.ibm.com/developerworks/rational/library/dec05/haumer/index.html?ca=drs-">IBM Rational Method Composer,</A> IBM's next-generation process management tool platform and conceptual framework for authoring, tailoring, and deploying development processes. Part One, presented here, offers a high-level understanding of the key capabilities of RMC, and it provides an overview of key concepts and typical RMC usage scenarios.