dans mon système j’ai un seule admin et c’est lui qui gére tout : Ajouter, modifier et supprimer un client, uploder les factures et les rapports et aussi il ajout le progrès des analyses.

i am making a class diagram of railway reservation system so as a start i will make the diagram consist of user and admin and ticket and train and ticketing system but i am having trouble of the association and identifying which is concrete class which is association class and the relationships between them. about my model admin can reserve so as user so i don’t know how to connect them all