For example, it is commonly accepted that achieving a 1 kcal/mol (chemical) accuracy for binding energies involving covalently bound molecular species is often desirable, but setting a similar accuracy target for activation energies, which can be on the order of 1 kcal/mol in some processes and more than 10 kcal/mol in others, may be misleading. Furthermore, one can have reaction mechanisms that involve larger and smaller barriers along the same reaction pathway or along multiple competing pathways. A 1 kcal/mol accuracy level does not work well for noncovalent interactions either. In fact, even the frequently mentioned value of about 0.1 kcal/mol may not be adequate in this case.