|
Many people will
make a process chart or flow chart of a process. Six Sigma
teaches this as on of it’s tools. Lean also makes a flow chart,
but it expands on the concept by also showing where the queues
exist. Lean also shows how the company controls the process
through MRP’s or other systems. Queues are the places where work
stops and waits before the next process step. Lean has you
measure both the process time and the queue wait times to better
understand how the process is really working. It then has you
sum all the process time and all the queue time and do a ratio.
This is a major addition to process improvement. It makes many
invisible aspects of the system visible. We have come to believe
that if you don’t know where the queues are and how they work,
you really don’t know how to make the process work better.
This is one of the
principles of process improvement that we found. You must make
things that are normally invisible to the workers and managers
visible so that it can be worked on. It is always amazing to us
how many things are hidden by systems. When you make them
visible people are often surprised by the results of the
measurement. People often quickly buy into making an improvement
after seeing the numbers.
|