Customer Service - Works with clients and customers (that is, any individuals who use or receive the services or products that your work unit produces, including the general public, individuals who work in the agency, other agencies, or organizations outside the Government) to assess their needs, provide information or assistance, resolve their problems, or satisfy their expectations; knows about available products and services; is committed to providing quality products and services. Specialized experience is defined as: Experience in the planning, testing and implementation of Directory Services infrastructure technologies in a large multi-domain Active Directory (AD) Environment, including AD object management, user and group management, Group Policy management, support of Domain Name System (DNS) services and user access and authentication.