CSDM (Common Service Data Model)

CSDM is the single decision that affects the most downstream capabilities. Service mapping, cost transparency, CMDB health, portfolio reporting, change impact analysis: all of them depend on a correctly implemented data model. Skip the foundation and every reporting dashboard, every automated workflow and every audit response that touches service data will carry the debt.

Version 5 of the CSDM framework introduced a clearer separation between the design layer (what you plan to build), the manage layer (what you operate) and the sell/consume layer (what users see). The metaphor that works is urban planning: the design layer is zoning, the manage layer is roads and utilities, and the sell/consume layer is the buildings people actually use. You cannot build the buildings without the roads, and you cannot lay the roads without the zoning.