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Unformatted text preview: the 1980s through the 1990s and a
more recent trend up in the early 2000's. Almost concurrent with the nadir of interest in energy
management during the 1990s, interest in lean manufacturing and six sigma increased dramatically,
with lean manufacturing continuing to gain momentum in literature while interest in six sigma
appears to have somewhat declined of late. Figure 2-1: This figure shows the Google Books ngram for the phrases "energy management" (blue),
"lean manufacturing" (red), and "six sigma" (green) between the years 1945 and 2008. The y-axis
shows the normalized rate of occurrence of those phrases in the Google American English corpus of
books over the relevant periods. In this context, the phrase "energy management" is used due to its
strong use specifically within industry, rather than the more popular phrase of "energy efficiency".
While the reduction of other waste through the lean manufacturing and six sigma process management methodologi...
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- Spring '14