(Essential Standard -- 3 points)
You need to explicitly state when the students will receive feedback, when you are available to help them, and the anticipated turn-around time on returning graded assignments back to them.
In terms of feedback, simply stating, "Email me questions and I will reply back to you," is not a sufficient statement to satisfy this standard, nor is "I will return feedback within a reasonable amount of time." What one person's definition of "reasonable" is, will likely differ from another's.
Information should be provided for email turnaround time, time required for grade postings, discussion posting responses, how you are available for online office hours. These should be appropriate to your time frames for grading, etc.
Providing this information will lessen the amount of inquiries you get on assignments and assessments.
Provide statements like:
"Unless otherwise stated, I will respond to emails within 24 hours on weekdays, or by the end of the day on Monday if you email me during the weekend. If you do not hear from me within those time frames, please send me a follow-up email or call my office number."
"Unless otherwise stated, I will generally grade and post assignments one week from when they are received."
Setup "virtual" office hours using the Collaborate, the chat room, discussions, or email. In that way, students will know when you are available for quick feedback.
Outside of these office hours, state your general turn-around time on feedback: "I check my email daily and will respond to your inquiries within twenty-four hours."
For assignments, stating something to the effect of, "All papers will be graded and returned to you two weeks after the posted deadline, if not beforehand."