This document summarizes a presentation about the Federation Lab and OpenID Connect. The Federation Lab is an identity toolkit that automates testing of identity software to increase interoperability between providers and consumers using SAML and OpenID Connect. It is a GÉANT project in collaboration with industry and research partners. The presentation discusses challenges like interoperability issues that can arise from complex identity systems with many implementations and deployments. Federation Lab addresses this by performing over 100 automated test flows on identity providers to discover errors. It also provides debugging tools. The presentation contrasts identity flows and attribute returning between SAML and OpenID Connect. In closing, the Federation Lab testing tool is made available for participants to use.