What does communication have to do with time management? Everything! Communicating your plans and goals gives you a feeling of accountability for them, provides those around you with needed information on what your priorities are, and puts you in a position to receive feedback on your plans.
You've organized your plans for the day, even made a list, and mapped your tasks out hour by hour... but you forgot to tell your parent/sibling/roommate your plans.
You're on break in between classes and you've decided to settle in the library to do some reading and research for a paper that's due next week... but your friends are in the Student Center when you walk by and really want to have lunch with you.
You're at work with a plan to buckle down and get some long overdue organizing done... then your supervisor walks in with a new project that you can't say no to.
Post your task list, priorities, or schedule in an easily viewed area so they are present and at the forefront
Manage your calendar electronically and share it with those who are important to you
Discuss your values with those who are impacted by so they understand why you may need to say "no" or reschedule