CIEDE2000

The DE00 (or CIEDE2000) equation was created in order to correct for the inaccuracies of DEab. It seems that the responsible CIE committee realized that CIELAB was not perceptually accurate in certain regions of the color space (mostly the dark blue and violet) -meaning that the quantified color difference did not correspond with the visual perception of the average observer. Instead of creating a new color space, they came up with color difference equations (DEcmc, DE94 and lately DE2000) that introduced certain weighting factors in the basic deltaE equation. It seems that this solution is working. (There is a lot more of literature on the topic)

CIELAB however is 3-dimensional. This means that when we evaluate the measurement data for, lets say, cyan we have to look at all three dimensions (L*,a*,b*) and most likely also C* and hue.
This constitutes the implementation of colorimeter in process control rather difficult, due to the demand of quick decisions and lack of knowledge regarding color spaces of press operators.

Apart from this, a topic worthy of discussion would be whether DE2000 (which provides significantly smaller DE numbers than DEab) is suitable for process control. The DE2000 data are not that sensitive to slight changes in color, and color shifts that might be important in terms of process control might go unnoticed.