title: UML class diagram design
body: <p>I am trying to implement the UML class diagram for the first time. This is the <a href="https://i.stack.imgur.com/fMIbt.png" rel="nofollow noreferrer">class diagram</a>  which I have been work through: 
  <a href="https://i.stack.imgur.com/fMIbt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fMIbt.png" alt="enter image description here"></a></p>
  
  <p>This is the requirement:
  <a href="https://i.stack.imgur.com/uW3z4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uW3z4.png" alt="enter image description here"></a></p>
  
  <p>I do not expect anyone do it for me, but I think I need someone help to check where I can improve or I anything is missing. Thank You.</p>