diff --git a/3.Integration Test Plan Document/ITPD.lyx b/3.Integration Test Plan Document/ITPD.lyx
index b0fbb9e..1db141b 100644
--- a/3.Integration Test Plan Document/ITPD.lyx	
+++ b/3.Integration Test Plan Document/ITPD.lyx	
@@ -1736,7 +1736,7 @@ This section shows the order in which subsystems will be integrated.
 \begin_inset Float figure
 wide false
 sideways false
-status open
+status collapsed
 
 \begin_layout Plain Layout
 \align center
@@ -2091,8 +2091,8 @@ An InvalidArgumentException is raised.
 \begin_inset Text
 
 \begin_layout Plain Layout
-A valid Credentials object (correct combination of username, password of
- the user)
+A valid Credentials object (with the correct combination of username and
+ password of the user)
 \end_layout
 
 \end_inset
@@ -2173,7 +2173,7 @@ Description
 \begin_inset Text
 
 \begin_layout Plain Layout
-This function verifies the user - password combination is correct.
+This function verifies the username - password combination is correct.
 \end_layout
 
 \end_inset
@@ -2248,8 +2248,7 @@ An InvalidArgumentException is raised.
 \begin_inset Text
 
 \begin_layout Plain Layout
-A valid Credentials object but without the correct combination of username,
- password of the user
+A Credentials object but with a wrong combination of username and password
 \end_layout
 
 \end_inset
@@ -2269,8 +2268,8 @@ Returns false.
 \begin_inset Text
 
 \begin_layout Plain Layout
-A valid Credentials object with the correct combination of username, password
- of the user
+A valid Credentials object (with the correct combination of username and
+ password of the user)
 \end_layout
 
 \end_inset
@@ -5011,7 +5010,7 @@ Returns a list of cars around the Location.
 \end_layout
 
 \begin_layout Subsection
-RMSS
+Requests Management SubSystem
 \end_layout
 
 \begin_layout Standard
@@ -5354,6 +5353,186 @@ Main functions implemented by the
 \end_inset
 
 
+\end_layout
+
+\begin_layout Standard
+\align center
+\begin_inset Tabular
+<lyxtabular version="3" rows="2" columns="1">
+<features tabularvalignment="middle" tabularwidth="70page%">
+<column alignment="center" valignment="top" width="0pt">
+<row topspace="1pt" bottomspace="1pt">
+<cell alignment="center" valignment="top" topline="true" bottomline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\family typewriter
+checkVerificationCode(User, int)
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset Tabular
+<lyxtabular version="3" rows="6" columns="2">
+<features tabularvalignment="middle">
+<column alignment="left" valignment="middle" width="36col%">
+<column alignment="left" valignment="top" width="50col%">
+<row topspace="1pt" bottomspace="1pt">
+<cell multirow="3" alignment="left" valignment="middle" bottomline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\series bold
+Description
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="left" valignment="top" bottomline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+This function verifies the username - verification code combination is correct.
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row topspace="1pt" bottomspace="1pt">
+<cell alignment="left" valignment="top" bottomline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\shape slanted
+Input Specification
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="left" valignment="top" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\shape slanted
+Effect
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row topspace="1pt" bottomspace="2pt">
+<cell alignment="center" valignment="top" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+A null parameter
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+A NullArgumentException is raised.
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row topspace="1pt" bottomspace="2pt">
+<cell alignment="center" valignment="top" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+An invalid object
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+An InvalidArgumentException is raised.
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row topspace="1pt" bottomspace="2pt">
+<cell alignment="center" valignment="top" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+A wrong combination of username of username and verification code of the
+ user
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+Returns false.
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row topspace="1pt" bottomspace="2pt">
+<cell alignment="left" valignment="top" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+The correct combination of username and verification code of the user
+\end_layout
+
+\end_inset
+</cell>
+<cell mroffset="0.5pt" alignment="left" valignment="top" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+Returns true.
+\end_layout
+
+\end_inset
+</cell>
+</row>
+</lyxtabular>
+
+\end_inset
+
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+</lyxtabular>
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+\begin_inset VSpace smallskip
+\end_inset
+
+
 \end_layout
 
 \begin_layout Standard
diff --git a/3.Integration Test Plan Document/res/img/Interfaces 1.png b/3.Integration Test Plan Document/res/img/Interfaces 1.png
index dbac4dc..07c317a 100644
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diff --git a/3.Integration Test Plan Document/res/img/Interfaces 2.png b/3.Integration Test Plan Document/res/img/Interfaces 2.png
index 8a7fe70..0a1c4cd 100644
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