At Promark, we know a quality sample list and well designed quotas help ensure the accuracy and intergrity of the data. We use only nationally recognized sample sources such as Survey Sampling, Voter Contact Services, and Labels and Lists. Their large databases enable Promark to draw a telephone sample from a wide variety of geographic and demographic specifications. Samples can be stratified and drawn according to client specifications. Any combination of random digit dial, listed, blended, or targeted samples can be combined to achieve accurate, efficient results.