"If your list isn't good it doesn't matter how good your survey is," Pingitore says.

“如果你的列表不是很好，调查没什么好，”Pingitore说。

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First-class postage is more expensive but also more effective than third-class, Pingitore says.

一流的邮费是更昂贵，但也更有效得多比三流的邮费，Pingitore说。

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If phone surveys are your only option, keep the questions short and make it clear right away that you're not trying to sell anything, Pingitore says.

如果电话调查是你唯一的选择，使问题短，弄清楚了你不是想卖任何东西，Pingitore说。

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