Open houses are the gold standard in real estate. They’ve been around for decades and will be ingrained in the buying and selling of homes for years to come.

The average buyer attends three open houses, according to the Zillow Group Consumer Housing Trends Report, a survey of more than 13,000 homeowners, sellers, buyers, and renters. Seventy-one percent of all buyers attend at least open house, and first-time buyers are even more likely to go (77 percent attend one open house or more).

But as a buyer, are you making the most of your open house visits?

Here are some best practices and helpful questions for buyers at all ends of the home-buying spectrum.

Use the open house to learn the market without committing

For the most part, open houses are just that – open. They make it possible for anyone to see a property in a certain time period, without an appointment or even being a very serious buyer.

New buyers should leverage the open house opportunity to get a feel for the market. In today’s world, using online search tools, mobile apps and the open house, a buyer can start to get a feel for pricing and the market before committing to an agent. Most importantly, open houses are some of the best ways for buyer and agent relationships to start.

You don’t have to sign in (but don’t be rude)

The biggest fear of some newer buyers is that a real estate agent at an open house will be all over them, ask for their contact information and then start harassing them for the next three weeks. It does happen, but it’s also common courtesy to at least recognize and say hello to the agent at the open house. Don’t forget, in addition to trying to sell the home for her client, for safety reasons, the agent is keeping a look out for who is coming and going. It’s polite to say hello and introduce yourself to the agent, but you can also politely decline to sign in.

If you’re an active buyer, you should make yourself known to the agent. Let the seller’s agent know who your agent is and don’t be afraid to express interest. When it comes time to review an offer with a seller, listing agents like to put a face to a name.

Watch the other buyers

You can tell a lot about the activity and marketability of a home by watching the other buyers. If you observe a lot of people walking in and out quickly, the home probably has some issues. Are the buyers hanging around, asking questions of the listing agent and huddling in the corner talking to their spouses or partners? If so, it could be a sign this is a well-priced and “hot” listing. If you’re interested, too, observing other buyers at the open house could help you learn about the competition.

Ask the agent questions

The real estate agent is there for a reason. It’s his job. If he is the listing agent, ask him questions. He is a direct line to the seller. He should know more than anyone about the property and the seller. Your agent can funnel your questions to the listing agent. But if you’re there, ask away. Watch the agent’s facial expression and reaction to your questions. If it’s a competitive market, ask questions such as: “Why is the seller selling?” “Is there a certain day to review offers or have you had a lot of showings?” In a slow market, ask how long the property has been on the market and what the seller’s motivations are. A good agent will engage you because it’s good for his seller.

Be open to meeting your future agent

When considering a new doctor, lawyer or CPA, you don’t get the chance to see them in their element until you’ve decided to work with them. Not true for real estate agents. Some of the best buyer/seller/real estate relationships begin at open houses.

A good agent is wearing two hats at the open house. In addition to watching the serious buyers and getting feedback for the seller, an active agent is also looking to interact with future clients.

Face to face, informal and relevant, the interaction with an agent at an open house is important. You can get a feel for a person just from a brief meeting. If you sense the agent could be someone you could work with, ask some open-ended questions, such as “How’s the market?” and “What areas do you cover?”

Why open houses have been around for decades

At any open house, there are people at every stage of the home-buying game, from just testing the waters to looking at homes daily, making offers and working closely with an agent. For someone new to the market, it’s helpful to know the best practices for visiting open houses and interacting with the real estate agent. For more experienced buyers, the open house is an opportunity to make a second or third visit, getting a closer look at the details and uncovering things you may have missed earlier. There are lots of reasons why open houses have been around for decades – and why you should take full advantage of them.

Take full advantage of the open house by asking questions to learn all you can about the home and listing.

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Note: The views and opinions expressed in this article are those of the author and do not necessarily reflect the opinion or position of Zillow.