Ø Advantages of combining six sigma with lean:
Sigma is output or goal oriented (Effective) & Lean is trimming the process(Making it efficient).
Six Sigma (Effectiveness) always comes first or precedes Lean (Efficiency). Every process first has to be effective then efficient.
Ex: Combination LSS
In a Manufacturing industry if Certain Unit produces 100 units against target of 100 Units Per Day With X cost then it is Effective.
Lean(Efficient)
a. If the same Unit produces 100 unit per Day with X-1 Cost
b. If Same unit produces 150 Units per day With X
c. If Same unit Produces 150 units per day with X-1 cost
Hence, Lean accelerates Six Sigma to Achieve Goal. Lean adds a Dimension to Six Sigma
Ø Disadvantage of combining six sigma with lean:
The Only disadvantage could be One Order of application, one cannot first apply lean and then Six Sigma.
In such case he again need to realign the Lean to optimize new process.
& one cannot parallel work on both, First system need to be established then optimizes.
Lean comes in Implementation (Strategy Implementation) of Six Sigma (Strategy Formulation) Approach of DMAIC.