IT4IT Reference Architecture Overview and Value Streams
Domain 1 tests how well you understand what the IT4IT Reference Architecture is for and how its value-stream structure fits together. IT4IT is a vendor-neutral reference architecture for managing the business of IT; it describes required capabilities, data, and end-to-end flows, not a mandatory process or org chart. The architecture centers on the IT Value Chain and four value streams: Strategy to Portfolio (S2P), Requirement to Deploy (R2D), Request to Fulfill (R2F), and Detect to Correct (D2C). Each value stream is made of stages and functional components that exchange data objects. The exam checks whether you can distinguish the reference architecture from a methodology, a tool, or a service management framework.
Core rules
- A value stream is an end-to-end flow that creates value for a stakeholder; it crosses organizational silos.
- Functional components are logical capability units; they produce, consume, and update data objects.
- Data objects are the stable integration points; they have lifecycles and relationships.
- IT4IT is descriptive and adaptable: use it to design, compare, and improve an IT operating model.
- The four value streams are not sequential phases; they run concurrently and share data.
Worked example
A company launches a new digital customer portal. Strategy and investment decisions sit in S2P. Requirements, design, build, test, release, and deployment sit in R2D. A user ordering access to the portal sits in R2F. Monitoring the portal and restoring it after an outage sits in D2C. The reasoning is based on the value being produced, not on the department performing the work.
Traps
Do not equate a value stream with a process or department. Do not assume a functional component must be a purchased application. Do not treat the four value streams as a waterfall. Do not ignore shared data objects, because integration across streams is a frequent exam theme.