Carol Ptak, CFPIM, CIRM, is a partner with the Demand Driven Institute, and was most recently at Pacific Lutheran University as Visiting Professor and Distinguished Executive in Residence. Ms. Ptak is a past president of APICS, and has authored several books on MRP, enterprise resource planning (ERP), Lean, and TOC. Chad Smith, CDDP, is a co-Founder and Partner at the Demand Driven Institute, and co-Founder and Managing Partner of Constraints Management Group (CMG), a leading implementer of demand driven operational systems for mid-range and large manufacturer and supply chains.