The document provides guidance on using a "crawl, walk, run" approach to build an IT service catalog. It begins by distinguishing between a service portfolio and service catalog, noting that a service catalog describes available IT services for customers. The document cautions against rushing the process and provides tips for each stage of development. In the crawl stage, it advises establishing baselines and collaboratively assembling an initial service list. In the walk stage, it stresses communicating vision, building a service model, and focusing on service targets.