Intelligence: Requires the ability to apply principles of logical or scientific thinking to define problems, collect data, establish facts, and draw valid conclusions; to interpret various technical instructions in mathematical or diagrammatic form; and to deal with several abstract and concrete variables. Language Ability: This requires the ability to read a variety of correspondence, reports, handbooks, forms, lists, and other documents, and to prepare correspondence, simple reports, forms, instructional materials, and similar documents using a prescribed format.