diff --git a/3.Integration Test Plan Document/ITPD.lyx b/3.Integration Test Plan Document/ITPD.lyx
index 2fe837e..d20d2f4 100644
--- a/3.Integration Test Plan Document/ITPD.lyx	
+++ b/3.Integration Test Plan Document/ITPD.lyx	
@@ -1821,7 +1821,7 @@ Authentication Manager
 \begin_layout Plain Layout
 
 \family typewriter
-register(Credentials)
+register(UserData)
 \end_layout
 
 \end_inset
@@ -1939,7 +1939,7 @@ A full set of information about the new user (username, password, name,
 \begin_inset Text
 
 \begin_layout Plain Layout
-The unique user data are correctly inserted in the database.
+The user data are correctly inserted in the database.
  
 \end_layout
 
@@ -2091,7 +2091,8 @@ An InvalidArgumentException is raised.
 \begin_inset Text
 
 \begin_layout Plain Layout
-An existent and valid Credentials object
+A valid Credentials object (correct combination of username, password of
+ the user)
 \end_layout
 
 \end_inset
@@ -2247,7 +2248,8 @@ An InvalidArgumentException is raised.
 \begin_inset Text
 
 \begin_layout Plain Layout
-An existent and valid Credentials object
+A valid Credentials object (correct combination of username, password of
+ the user)
 \end_layout
 
 \end_inset