diff --git a/Lectures/L19_AssuranceCase/AssuranceCase.pdf b/Lectures/L19_AssuranceCase/AssuranceCase.pdf
index ecd2a37bf8a19241de2d2a9beb6fa734ad478856..86267ad9636faaf8e9de9952c75c9dbb1ee91695 100644
Binary files a/Lectures/L19_AssuranceCase/AssuranceCase.pdf and b/Lectures/L19_AssuranceCase/AssuranceCase.pdf differ
diff --git a/Lectures/L19_AssuranceCase/AssuranceCase.tex b/Lectures/L19_AssuranceCase/AssuranceCase.tex
index 1cc55b8c259ae7f1629e01e1e897cdc5ce8625bd..2d49441ddb977f88b3406ddfc1c008283cf46fe7 100755
--- a/Lectures/L19_AssuranceCase/AssuranceCase.tex
+++ b/Lectures/L19_AssuranceCase/AssuranceCase.tex
@@ -110,7 +110,8 @@
   \item Demonstration
   \item Summarize testing results
   \item Usability test with the class (show of hands for data)
-  \item Code walkthrough
+  \item Code walkthrough with class
+  \item Usability survey with class
   \item Technology overview
   \begin{itemize}
     \item CI/CD