The above examples display that chemical reactivity can change drastically in different solvents, and that a diverse set of methods are used to determine this solvent effect. While some rates change systematically with a number of solvent polarity measures, it is not always clear which properties of the solvent and reactant structure will have an effect on the rates. Experimental data are only available for certain reactions in some reaction families, most extensively hydrogen abstraction. It is hard to generalize effects to a whole family of reactions without both experimental and theoretical data, and a variety of reactants and solvents tested, which would require a lot of experiments and/or calculations. Augmenting these data for reaction families beyond hydrogen abstraction would greatly benefit the kinetics community.