Terminology

We use the terms ‘must’ and ‘should’ in the following ways.

• ‘You must’ is used for a legal or ethical duty you’re expected to meet (or be able to justify why you didn’t). 
• 'You should’ is used for duties or principles that either:
  • may not apply to you or to the situation you’re currently in, or
  • you may not be able to comply with because of factors outside your control