English: 'a)' The concentrations of substrate and/or product are monitored over time by methods such as In Situ IR, UV-Vis, or NMR or may be obtained by taking the integral of (c). 'b)' Presenting the fractional conversion of substrate provides a normalization of the data in (a). 'c)' The rate of reaction progress (product formation) is monitored over time by methods such as reaction progress calorimetry or may be obtained by taking the first derivative of (a). 'd)' Describing the rate of reaction progress with respect to consumption of starting material spreads the data into a more informative distribution than observed in (c). Note that reaction progress is read from right (maximum substrate concentration) to left (no remaining substrate) in (d).