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+```plantuml
+
+@startuml
+
+left to right direction
+
+skinparam usecase {
+BackgroundColor lightGreen
+BorderColor DarkSlateGray
+
+ArrowColor darkgreen
+}
+
+actor User as User
+actor Admin as Admin
+actor Teacher as Teacher
+actor Student as Student
+actor Visitor as Visitor
+
+User <|--- Admin
+User <|---- Teacher
+User <|-- Student
+Visitor <|- User
+
+note left of (User)
+  The user must
+  be connected
+end note
+
+
+package App {
+ 
+  usecase "Add a group" as ES1.1
+  usecase "Delete a group" as ES1.2
+  usecase "Import students automatically \n from an Excel doc" as ES1.3
+  usecase "Show the groups" as ES1.4
+  usecase "Delete a user" as ES1.5
+  usecase "Show the users list" as ES1.6
+  usecase "Give a role" as ES1.7
+  usecase "Add a student in a group" as ES1.9
+  usecase "Delete a student in a group" as ES1.10
+  usecase "Ban a user" as ES1.11
+  usecase "Choose if a quiz is \n accessible only to a particular group \n or open to all, to each group" as ES1.13
+  usecase "Share my quiz with other teachers" as ES1.14
+  usecase "Listen to the words to also \n work my listening comprehension" as ES1.15
+
+
+
+  usecase "Create an interactive quiz during a course" as ES2.1
+  usecase "Know my overall progress since I installed the app" as ES2.4
+  usecase "Consult the translation and the meaning \n of certain words in an online dictionary" as ES2.5
+  usecase "Create my own flash card to train myself" as ES2.7
+  usecase "Know my progress on a quiz" as ES2.8
+  usecase "View student results who \n participate in my quizzes at all moment" as ES2.9
+
+  usecase "Create a quiz for students training" as ES3.1
+  usecase "Download quizzes to do them \n later without an internet connection" as ES3.3
+  usecase "Join a quizz with a code" as ES3.4
+  usecase "Have access to the vocabulary \n list with a link" as ES3.6
+  
+  usecase "Evaluate students from anywhere" as ES4.1
+  usecase "Receive an email to notify \n me when I’m about to have an exam " as ES4.2
+  usecase "Change the level of my \n trainings games/quizzes" as ES4.3
+  usecase "Choose if I want to work \n from English to French or vice \nversa in the tests" as ES4.4
+  usecase "Choose a strict difficulty mode (0 error) \n or tolerant (1 or 2 errors) for my exams" as ES4.5
+
+  usecase "Easily switch from dark \n theme to theme clear and vice versa \n when I’m on the application (web or mobile)" as ES5.1
+  usecase "Change the speed of scrolling \n flashcard when I use scroll mode automatic" as ES5.3
+  usecase "Change my password" as ES5.6
+  usecase "Receive a message encouraging the end \n of my test to motivate me to continue" as ES5.8
+  usecase "Show my rank on quizzes" as ES5.10
+
+
+  usecase "Play a game in a demo to test the app" as ES6.1
+  usecase "Play a game" as ES6.2
+  usecase "Choose a game" as ES6.3
+  usecase "Choose the vocabulary list" as ES6.4  
+  usecase "Give feedback after a quiz" as ES6.5
+  usecase "Sign in" as ES6.6
+  usecase "List quizzes/Vocabulary" as ES6.7
+  usecase "Delete a quiz" as ES6.8
+  usecase "Change nickname" as ES6.9
+}
+
+Admin --> ES1.1
+
+Admin --> ES1.3
+Admin --> ES1.4
+Admin ----> ES1.6
+Student --> ES1.15
+
+Teacher -> ES2.1
+Student --> ES2.4
+Student --> ES2.5
+Student --> ES2.7
+
+ES6.2 <.. ES2.8 : include
+
+
+Student --> ES3.3
+Student --> ES3.4
+
+ES3.1 ..> ES3.6 : extends
+ES2.1 ..> ES3.6 : extends
+
+Teacher ---> ES4.1
+Student --> ES4.2
+
+ES4.1 ..> ES4.5 : include
+ES3.1 ..> ES1.13 : include
+
+ES3.1 ..> ES1.14 : extends
+
+Teacher --> ES3.1
+
+ES6.3 ..> ES4.3 : extends
+ES6.3 ..> ES4.4 : include
+ES4.1 ..> ES2.9 : extends
+
+Visitor --> ES5.1
+User --> ES5.3
+User --> ES5.6
+
+ES3.4 <.. ES5.10 : include
+ES6.2 <.. ES5.8 : include
+
+Visitor --> ES6.1
+Student --> ES6.2
+Visitor --> ES6.6
+Teacher --> ES6.7
+User --> ES6.9
+
+ES6.2 ..> ES6.3 : include
+ES6.3 ..> ES6.4 : include
+
+ES6.2 <.. ES6.5 : include
+
+ES6.7 ..> ES6.8 : extends
+
+ES1.6 ..> ES1.7 : extends
+ES1.6 ..> ES1.5 : extends
+ES1.6 ..> ES1.11 : extends
+
+ES1.4 ..> ES1.2 : extends
+ES1.4 ..> ES1.9 : extends
+ES1.4 ..> ES1.10 : extends
+
+ES1.6 ..> ES1.9 : extends
+
+
+
+@enduml
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