Why are the other login types available on the HarvardKey login screen?

As Harvard University’s primary login credential, HarvardKey grants you access to the applications and services you use every day with a single login name and password. As more and more applications and services in the Harvard ecosystem adopt HarvardKey access, your HarvardKey will grant you access to a growing number of resources. However, you will sometimes see the option to log in using other types of credentials too. If you have a different Harvard credential type – eCommons or XID, for example - you can use those to log in to resources that offer those options.

Users who haven't yet claimed a HarvardKey can continue to log in at all HarvardKey login screens using their usual credentials simply by clicking the appropriate tab at the top of the screen.