Defines documents, analyzes, performs, and interprets developmental tests both automated and manual for new and/or modified products or product components. Investigates and resolves operational problems in conjunction with other engineering and technical personnel. Provides technical support and advice to other engineering groups. Guides and directs lower level personnel on the set-up and performance of tests. Acts as liaison with outside suppliers in establishing or modifying specifications for purchased items. Devises and applies testing procedures both automated and manual for parts or sub-assemblies received from outside vendors. Participates in the development, maintenance and refinement of internal quality control and reliability programs.