What should young PMs, who own little experience and poor judgement, base their decisions on?

They should based their decision on their concepts and discussion with the senior members if possible.

Hypothetically, should base their decisions on a similar former projects and should seriously seek a good help.

First get experience and then act as a PM

The most likely situation here will be that of poor judgement, as there is usually a requisite level of experience, knowledge and accomplishment to be obtained for one to become a PM.

Decisions would normally be based on laid down rules with due consideration to urgency and importance of the particular event.

When decisions are crucial for success of a particular project and you are young PMP, the decisions should be based on following criterion.

- List down possible decision/way forward to accomplish desired results.

- Assess viability of these possible way out/options in consultation with Seniors/PMP standard.

- Once you have selected the best possible solution, discuss it with a senior member of PM team to have a list of pros & cons which may arise.

- Compare your option with a similar project which was successfully executed, & see how your solution will work.

- Last but not the least, monitor the success rate on a periodical basis.

- List down all the possible events / outcomes of the project, which may prove worthy for your next upcoming project.

- As sky is the limit for improvement, there is always a chance for improvement, which will come by the passage of time & work.

This is not the end, just the start.