The Principles - Value stream

7 important questions on The Principles - Value stream

What is value stream mapping (VSM)?

A Lean method of making two mappings of product process:
  • The as -is situation
  • the to- be situation

What are the difficulties by making value streams and how can they be adressed?

An excessive level of details; limit the number of blocks
Discussion about the exact steps;

Name the three metrics for an value stream mapping

Lead Time (LT)
Process Time (PT)
Percent complete and accurate (%C/A).
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Why is a value stream mapping important?

  • The as- is mapping shows all members the real numbers of inefficiency
  • helps focusing on the value to be created than on the task
  • to identify and eliminate bottlenecks, while avoiding the optimization trap
  • helps to realize one of the key ideas of DevOps: a smooth and uniform flow to deliver outputs continously, without delays and optimal resource utilization

What are the questions that usually arise after making the value stream mapping?

  • How can we achieve complete absence of errors transferraed from one step to another (no more waste of time and resources for reworking) (%C/A)
  • How can we radically reduce time lost in queues and waiting (LT)
  • How can we change working practices, to reduce the processing time at each step? (PT)

Who developed the theory of constraints and what does it means?

Eliyahu Goldratt.
There is one and only one real bottleneck in any system at one point in time, that slows down the work, and efforts spend on anything other than eliminiation of this bottleneck is a waste of time.

Why should a value stream map be made?

To help optimize business processes.

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