Value chain analysis is one of the most powerful starting points in enterprise architecture and business process improvement — but getting real analytical value from it requires going well beyond a Porter diagram on a whiteboard. This white paper covers the full value chain toolkit: core concepts, reference models (including SCOR and VRM), a structured approach to documenting and analysing each value chain step, and a practical framework for deciding between incremental improvement and radical redesign. It is a hands-on reference for architects and business analysts working on process improvement, operating model design, or strategic transformation.