diff --git a/Big Ideas/Topics.md b/Big Ideas/Topics.md
index 4e209cf..04352cd 100644
--- a/Big Ideas/Topics.md	
+++ b/Big Ideas/Topics.md	
@@ -120,3 +120,15 @@ The following list was derived from https://identitymanagementinstitute.org/laye
   * bcrypt, pbkdf2 and other hashing and storing suggestions
   * Securing your database
 
+### Authentication for 1st and 3rd Parties
+
+#### OAuth2
+
+#### OpenID Connect
+
+#### SAML 2.0
+
+#### CAS?
+
+### Single Sign-on
+