Yellow Pages-specific syndicated research data from Knowledge Networks/ Statistical Research Inc. (KN/SRI) and other third party sources guides directory selection. Wahlstrom also maintains a proprietary database which categorizes each Yellow Pages directory based on its unique scope and usage. This database helps project how each directory will perform for specific product and service categories.

In addition, client-specific data and insights provide a key component in developing directory recommendations. These may encompass client sales data, customer count data, demographic, lifestyle or SIC data.