The most important thing that must be done between team member’s is communication. Changes to the timeline can be avoided if team members are constantly communicating whether via text, calls, emails, or in person. I agree with ial4 that if Patty spoke with Dr. Derek Malekai before coming up with the timeline than this whole issue could have been avoided. If a manager is being unruly or unrealistic, they need to be spoken to. They need to be told why it would not work out with facts supporting your claim. If that is not enough than maybe is would be best to replace the manager with someone else, worst case scenario.