title: Sequence Diagram for Registration and Reporting
body: <p>I am doing sequence diagrams, but I have some issues in the design of these diagrams. So I was doing the diagram for Account Creation as follows:</p>
  
  <p><img src="https://i.stack.imgur.com/eI9Vm.png" alt=""></p>
  
  <p>So, first the user goes to the registration page and then enters his information. I also wanted to show what would happen if the information entered by the user in the registration page are incorrect: I added the verify input arrow from the registration page to the database.</p>
  
  <ol>
  <li><p>I am not sure who should verify that the input is correct, is it correct to say it's the database that checks if the entered data are valid?</p></li>
  <li><p>Moreover, is it correct to add the dashed arrow from the database to the registration page or should I go directly to the if condition?</p></li>
  <li><p>What would you advice me to change?</p></li>
  </ol>
  
  <p><img src="https://i.stack.imgur.com/V9UKo.png" alt="enter image description here"></p>