How do the regulatory authorities evaluate the bioequivalence of generic drugs?

Dr. Kimberly W. Raines, a reviewer for the United States Food and Drug Administration (FDA) Division of  Bioequivalence 2, has provided a good primer on generic drugs and bioequivalence at https://www.fda.gov/downloads/forpatients/about/ucm410215.pdf. The details of the evaluation process for bioequivalence can vary between the national regulatory authorities of different countries but most countries adopt the same principles as used by the FDA.