Value Stream Mapping 

Overview

Value Stream Mapping (VSM) is a visualization tool oriented to the Toyota version of Lean Manufacturing (Toyota Production System). It helps to understand and streamline work processes using the tools and techniques of Lean Manufacturing.

VSM addresses material process sequences and flows as well as information flows that impact this movement. It encourages data acquisition in a systematic manner that often gives additional insights. The various icons and symbols have fairly specific meanings and it requires knowledge of these symbols as well as knowledge of TPS to interpret a Value Stream Map and use it well.

Value Stream Maps reflect a broad view of the process, usually from external supplier to external customer at a given facility. Extended Value Stream Maps take an even broader view and often incorporate tier two and tier three suppliers and distributors.

Like Process Mapping, VSM is most valuable in a group setting. Many of the problems it exposes reach across organizational lines of responsibility and expertise. When a mapping team has representation from all the different functions and specialties, it gains a common understanding of the process and a better position for developing and implementing good solutions.

When To Use Value Stream Maps

No mapping technique fits every situation and purpose. Use Value Stream Mapping for high-production, low-variety product mixes with few components and subassemblies and dedicated equipment. In other situations, Process Mapping, often combined with a Group Technology analysis may be a better choice.

Present State Mapping

A Present State Map shows work processes as they currently exist. This is vital both to understand the need for change and to understand where opportunities lie. While Value Stream Maps appear complex, their construction is easy when taken in logical steps. These  illustrations show how. A broad-based team should perform this exercise.