This article, the third in a three-part series, explains why IBM Rational Unified Process (RUP) is the right choice from a methodology perspective for defining and building a Service-Oriented Architecture (SOA). You also learn how future software development efforts can use Extreme Programming (XP) concepts and the XP methodology to build, assemble, and reuse services after your enterprise has built the foundations for an SOA. The proposed service-oriented unified process (SOUP) is a software process that provides a perfect mix of RUP and XP for SOA development.

http://www.soainstitute.org/articles/article/article/build-your-soa-maturity-and-methodology-part-3.html

This article introduces the concept of a Service-Oriented Architecture (SOA) maturity model. Based on the Capability Maturity Model (CMM), the S0A maturity model helps organizations assess and assign a maturity level to their architecture, which in turn helps them identify the steps (products, services, and so on) needed to get to the next level.

http://www.soainstitute.org/articles/article/article/build-your-soa-maturity-and-methodology-part-2.html