Common Service Data Model
The data architecture that makes every ServiceNow module work together.
Book a Discovery CallThe Common Service Data Model is ServiceNow's recommended framework for structuring service and infrastructure data. Without it, modules operate in silos and AI has no coherent data layer to work from. MainStack implements CSDM as the architectural backbone of every platform, ensuring long-term scalability and cross-domain alignment.
Common Challenges We Solve
- Business services, technical services, and application services defined inconsistently, or not at all
- ITSM, ITOM, and CSM operating on different data models with no shared service layer
- GenAI and Now Assist initiatives blocked because service context doesn't exist in the platform
- Platform upgrades repeatedly breaking customisations built outside the CSDM model
[ Why it matters ]
CSDM adoption has moved from optional to foundational. Every ServiceNow module released in the last three release waves, and every AI capability shipping under the Now Assist banner, assumes a working CSDM data layer underneath. Customers who skip it find that ITSM, ITOM, and CSM each create their own service definitions, Now Assist has no consistent service context to reason over, and platform upgrades repeatedly break customisations built around the old model.
CSDM is not a one-time data migration. It is an architectural discipline that governs how Business Applications, Application Services, and Technical Services are defined, related, and maintained across the platform. Getting the four layers right, and keeping them right, is what makes the difference between a ServiceNow estate that compounds value and one that fragments under its own weight.
[ How MainStack delivers ]
Our CSDM engagements start with a current-state blueprint: what exists today, which layers are populated, which relationships are inferred from Discovery versus maintained manually, and where the commercial and operational models diverge. We map that against the four CSDM layers and produce a phased adoption roadmap aligned to the modules and initiatives you already have in flight.
Build is executed alongside a design council we help you set up. Every new CI class, relationship type, and service definition passes through a lightweight but mandatory review, preventing the slow drift that kills most CSDM programmes. Data migration is handled with deduplication, normalisation, and relationship inference from Discovery and the CMDB, so legacy service data arrives in the new model clean enough to build AI capability on top of.
[ What We Deliver ]
CSDM Blueprint
Current-state assessment against the four CSDM layers (Foundational, Design, Sell/Consume, and Manage) with a phased adoption roadmap aligned to business priorities.
Domain Model Build
Full implementation of the CSDM taxonomy: Business Application, Application Service, Technical Service, and CI relationships, built to ServiceNow best practice.
Data Migration & Mapping
Migration of legacy CI and service data into the CSDM model, including deduplication, normalisation, and relationship inference from Discovery and CMDB sources.
AI Readiness Layer
Service context enrichment that creates the structured data layer Now Assist and GenAI initiatives require, so AI features actually work in your environment.
Architecture Governance
Design council setup, CSDM governance playbooks, and quarterly health review templates: the operating model that prevents CSDM drift after implementation.
Ready to get started with CSDM?
30-minute discovery call. No pitch deck. We'll tell you honestly if we're the right fit.
Book a Discovery Call