This comprehensive AAPS online training course was developed for those interested in learning more about the field of immunogenicity. This eCourse will provide an in depth overview of beginning through advanced topics for the assessment and interpretation of immunogenicity. As the field of biologic drug development is maturing, a wealth of knowledge has emerged on the topic of immunogenicity from the disciplines of immunology, bioanalytical sciences, protein manufacturing and formulation, and regulatory sciences. This AAPS eCourse utilizes experts from these disciplines to educate the participants in the following areas: