The big difference between business process reengineering and continuous improvement programs like TQM or Six Sigma is that A business process reengineering requires benchmarking and rapid adoption of best practices whereas TQM and Six Sigma deal with making bis gains in the efficiency with which value chain activities are being performed$\mathrm{.}8.$ reengineering is a tool for achieving one$-$time quantum improvement on the order of $30$ to $50$ percent or more, whereas TQM and S$\backslash$$ Sigma programs stress ongoing incremental improvement, striving for inch$-$by$-$inch gains again and again in a never$-$ending stream.C$.$ reengineering represents an effort to totally revamp a firm's value chain whereas TQM looks at incrementally improving the performance of two or three targeted value chain activities and Six Sigma is used primarily for reducing manufacturing defects.D$.$ process reengineering helps create core competencies whereas TQM$/$Six Sigm$$rare tools for making a core competence stronger and more efficient.E reenen neering is a tool for creating an organization structure consisting of many process departments whereas TQM$/$Sox Sigma concern defect$-$free production methods and delivering world$-$class customer service.

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