If you have followed the previous rule and the ball is always in their court, you need to make sure that they keep playing.
The best way to do this is to make sure you follow up all communications that require a reply, whenever you feel that a bottleneck is forming.
The best ways to follow up a client are:
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Use email
If there is no response, find the original email and resend.
See our Rules To Better Email - Use IM or Skype
See our Rules To Better Instant Messenger - Use the phone
Call them
Tip: You can use FollowUpThen.com for your follow up emails.