The agent who ultimately caused the buyer to purchase the home and earned the commission is generally the procuring cause agent.  Every state Realtor association has its own guidelines that establish procuring cause, none of which set in stone.  As a Buyer, your best bet to avoid procuring cause disputes is to be upfront with each real estate agent you interview and work with the best qualified to help you find a home.

Make other Agents aware that you are working with another agent.
Agents should ask you if you are working with another Agent.   Even if they do not ask, let them know that you are currently working with a particular Agent.

Sign a buyer’s broker agreement with your agent.
Buyer’s broker agreements will clearly describe the relationships, compensation and duties.

Do not ask another agent to show you property.
Your Agent wants to help you and part of their duties is to show you homes for sale, even if those are homes that you have located yourself.

Do not directly call listing agents for information.
Your Agent will usually get more detailed information from the Listing Agent than you will get. Your Agent will know the right questions to ask.  There will be no confusion if your Agent calls the Listing agent.

Follow Open House protocol if you go unescorted.
If you attend Open Houses without your Agent, hand your Agent’s business card to the Agent hosting the Open. Sign guest books with your Agent’s name next to your own. Not only will this help protect you, the open house agent won’t try to corral you or request personal information.

Remember, an Agent does not get compensated for all their time and efforts until a deal gets to closing.    How would you like to work and not get paid for your services?