Poka-yoke (ポカヨケ) is a Japanese term that means "mistake-proofing".  It is derived from poka o yokeru (ポカを除ける), a term in shogi and igo referring to avoiding an unthinkably bad move.  

  Zero Quality Control is a method/approach for achieving zero defects in an organization.  Zero gives reference to the objective of ZQC which is to produce products/services with zero defects. 

  The DMAIC Method is a problem solving methodology used within a six sigma strategy.  The methodology focuses on improving business processes, specifically through the improvement of quality and reducing variation.  It is an Integral part of six sigma.

  Single minute exchange of die is a concept developed by Shigeo Shingo which seeks to perform all setup/changeover times under ten minutes (single minute).

  The standard deviation is a statistic that tells you how tight or loose the range/spread of data is in relation to the mean or average of the data.  Typically when a data range is clustered tightly the "bell curve" will be tall/steep.  When the data is range is spread far apart the "bell" will appear flat or short and wide.  

  The mean absolute deviation or MAD as it is often abbreviated, of a dataset is the average or "mean" distance between each data point from the data set and the mean/average.  This will give you an idea of the amount of variability in a dataset.  MAD can be calculated from both observations and the arithmetic average (mean) of those observations.  Another option when calculating MAD is to calculate based on actual data minus forecasted data.  If forecasting or being used for future analysis you can apply different weights to your forecast or use exponential smoothing in an attempt to make your forecast more accurate.  In most cases however mean absolute deviation uses actual data.