diff --git a/chapters/3.application-design/3.0.application-design.tex b/chapters/3.application-design/3.0.application-design.tex
index 4a4560c..56ae61e 100644
--- a/chapters/3.application-design/3.0.application-design.tex
+++ b/chapters/3.application-design/3.0.application-design.tex
@@ -2,7 +2,8 @@
 
 \input{chapters/3.application-design/3.1.application-parts}
 \input{chapters/3.application-design/3.2.user-categories}
-\input{chapters/3.application-design/3.3.use-cases}
-\input{chapters/3.application-design/3.4.technology-stack}
-\input{chapters/3.application-design/3.5.implementation-methodology-specification}
-\input{chapters/3.application-design/3.6.architecture.design}
+\input{chapters/3.application-design/3.3.requirements}
+\input{chapters/3.application-design/3.4.use-cases}
+\input{chapters/3.application-design/3.5.technology-stack}
+\input{chapters/3.application-design/3.6.implementation-methodology-specification}
+\input{chapters/3.application-design/3.7.architecture.design}
diff --git a/chapters/3.application-design/3.1.application-parts.tex b/chapters/3.application-design/3.1.application-parts.tex
index 53e3193..722e7c5 100644
--- a/chapters/3.application-design/3.1.application-parts.tex
+++ b/chapters/3.application-design/3.1.application-parts.tex
@@ -1,4 +1,4 @@
-\section{Λογικά μέρη}
+\section{Λογικά μέρη} \label{section:3-1-logical-parts}
 
 % Παλιό από Drive
 Η πλατφόρμα μπορεί να διαχωριστεί σε δύο λογικά μέρη:
diff --git a/chapters/3.application-design/3.2.user-categories.tex b/chapters/3.application-design/3.2.user-categories.tex
index 06ed76d..33aa64f 100644
--- a/chapters/3.application-design/3.2.user-categories.tex
+++ b/chapters/3.application-design/3.2.user-categories.tex
@@ -1,4 +1,4 @@
-\section{Κατηγορίες χρηστών}
+\section{Κατηγορίες χρηστών} \label{section:3-2-user-categories}
 
 % Παλιό από Drive
 \subsection{Πρώτο μέρος}
diff --git a/chapters/3.application-design/3.3.requirements.tex b/chapters/3.application-design/3.3.requirements.tex
new file mode 100644
index 0000000..daa4ffe
--- /dev/null
+++ b/chapters/3.application-design/3.3.requirements.tex
@@ -0,0 +1 @@
+\section{Απαιτήσεις λογισμικού} \label{section:3-3-requirements}
diff --git a/chapters/3.application-design/3.3.use-cases.tex b/chapters/3.application-design/3.3.use-cases.tex
deleted file mode 100644
index c1e3ed1..0000000
--- a/chapters/3.application-design/3.3.use-cases.tex
+++ /dev/null
@@ -1 +0,0 @@
-\section{Σενάρια χρήσης}
diff --git a/chapters/3.application-design/3.4.use-cases.tex b/chapters/3.application-design/3.4.use-cases.tex
new file mode 100644
index 0000000..32bbfc7
--- /dev/null
+++ b/chapters/3.application-design/3.4.use-cases.tex
@@ -0,0 +1,4 @@
+\section{Σενάρια χρήσης} \label{section:3-4-use-cases}
+
+Βασικό μέρος την σχεδίασης της πλατφόρμας ήταν η καταγραφή των απαιτήσεων η οποία έγινε στο προηγούμενο κεφάλαιο (\ref{section:3-3-requirements}) καθώς και η σχεδίαση και ανάπτυξη των σεναρίων χρήσης.
+
diff --git a/chapters/3.application-design/3.4.technology-stack.tex b/chapters/3.application-design/3.5.technology-stack.tex
similarity index 99%
rename from chapters/3.application-design/3.4.technology-stack.tex
rename to chapters/3.application-design/3.5.technology-stack.tex
index 186a511..d65fd49 100644
--- a/chapters/3.application-design/3.4.technology-stack.tex
+++ b/chapters/3.application-design/3.5.technology-stack.tex
@@ -1,4 +1,4 @@
-\section{Τεχνολογίες}
+\section{Τεχνολογίες} \label{section:3-5-technologies}
 
 \subsection{Ethereum}
 
diff --git a/chapters/3.application-design/3.6.architecture.design.tex b/chapters/3.application-design/3.6.architecture.design.tex
deleted file mode 100644
index b83c6d6..0000000
--- a/chapters/3.application-design/3.6.architecture.design.tex
+++ /dev/null
@@ -1 +0,0 @@
-\section{Αρχιτεκτονική}
diff --git a/chapters/3.application-design/3.5.implementation-methodology-specification.tex b/chapters/3.application-design/3.6.implementation-methodology-specification.tex
similarity index 97%
rename from chapters/3.application-design/3.5.implementation-methodology-specification.tex
rename to chapters/3.application-design/3.6.implementation-methodology-specification.tex
index f4d9d5f..cce1951 100644
--- a/chapters/3.application-design/3.5.implementation-methodology-specification.tex
+++ b/chapters/3.application-design/3.6.implementation-methodology-specification.tex
@@ -1,4 +1,4 @@
-\section{Προδιαγραφή μεθόδου υλοποίησης και χρονοπρογραμματισμός}
+\section{Προδιαγραφή μεθόδου υλοποίησης και χρονοπρογραμματισμός} \label{section:3-6-implementation-methodology-specification}
 
 \subsection{Προδιαγραφή κύκλων}
 
diff --git a/chapters/3.application-design/3.7.architecture.design.tex b/chapters/3.application-design/3.7.architecture.design.tex
new file mode 100644
index 0000000..b04c169
--- /dev/null
+++ b/chapters/3.application-design/3.7.architecture.design.tex
@@ -0,0 +1 @@
+\section{Αρχιτεκτονική} \label{section:3-7-architecture-design}
diff --git a/thesis.pdf b/thesis.pdf
index b3b2e6f..ff3c62b 100644
Binary files a/thesis.pdf and b/thesis.pdf differ