Final answer:
The sentence should correctly abbreviate 'September' as 'Sept.' to adhere to standard abbreviation rules. Deadlines should be stated clearly, such as 'The project deadline is Mon. 3 Sept.', ensuring that abbreviations used are commonly understood and standardized.
Step-by-step explanation:
The sentence 'The project deadline is Mon. 3 September' is close to being correct according to standard rules of abbreviations, but it contains a small mistake. According to the conventional rules, September should be abbreviated as 'Sept.' if abbreviations are used. Hence, the correct sentence would be 'The project deadline is Mon. 3 Sept.'
It's also worth noting that when using abbreviations for days of the week, it is generally acceptable, as 'Mon.' for Monday. When citing deadlines or important dates, like the end of the week deadline, clarity is crucial, so using abbreviations is permissible as long as they are standardized and commonly understood.
As for personal communications regarding project deadlines, such as the details exchanged between Jane and her supervisor, these details should be expressed clearly to avoid any misunderstanding. For instance, Jane made sure to confirm her intent to prioritize the project to meet the deadline.