Discuss the best practices for functional and non-functional requirements?

The Assignment must be in MS Word format, 1.5 spacing, 11-pt Calibri (Body) font and 2.54 cm margins on all four sides of your page with appropriate section headings. Reference sources must be cited in the text of the report and listed appropriately at the end in a reference list using Harvard referencing style. Assignment Description: Q1. Discuss the best practices for functional and non-functional requirements? Q2. Illustrate why it is difficult, in practice, to separate functional and non-functional requirements in the requirements document? Q3: In the next statements determine if missing or uncertain requirements in train sale ticket system? As well as the system diagram? Train tickets are sold with mechanical ticket system. The user chooses his destination and enter his/her credit card with personal information. Train ticket is issued charged credit card account. When the user presses the start button, a menu is displayed possible destinations are displayed with a message for the user to specify the destination. Once the destination is determined, the user has to enter their credit card. As well validity is verified and then user is asked to enter personal information. And while The credit transaction is validated, then the ticket is issued. Also draw system diagram? Note: The marking criteria varies for each Assignment Sections to be included in the report Description of the section Marks Question 1 Explain the the best practices for functional and non-functional requirements 30 Question 2 Explain the difficult, in practice, to separate functional and non-functional requirements 30 Question 3 Explain the determine if missing or uncertain requirements in train sale ticket system? As well as draw the diagram system?