BOSTON--(BUSINESS WIRE)--March 30, 2005--Health Dialog Services Corporation today announced that Highmark Inc., an independent licensee of the Blue Cross and Blue Shield Association, has chosen to continue its alliance with Health Dialog through 2011. Highmark has extended the agreement in recognition of the collaborative relationship with Health Dialog, and the many supportive relationships that have been built between Health Dialog Health Coaches and Highmark members. Highmark has been a Health Dialog client since 1999, and provides its more than three million members with access to Health Dialog's services through a program known to Highmark members as Blues On Call(SM).