If the audience can't understand the dialogue, then it was pointless to have dialogue in the script.
Ric Viers, sound designer, author of The Sound Effects Bible
Much of your success as a dialogue editor hinges on your relationship with the picture department, particularly the assistant picture editor. Simply put, you need materials from them that aren't always convenient to come up with. Your understanding, charm, and decency in dealing with the folks in picture can make the difference between an easy start or several days of begging, deal-making, or strong-arming—never knowing if it will get you the elements you need to do your job.
You may encounter some friction with the picture department. ...