Acquires or verifies knowledge of subject by interviewing workers engaged in developing new products and services or in making improvements, observing performance of experiments and methods of production, referring to blueprints, sketches, engineering drawings and notes, trade and engineering journals, rewrites of articles, bulletins, manuals, or similar publications. Writes, in clear and concise language, such technical documents as procedure manuals, service manuals, and related technical publications concerned with installation, operation, and maintenance of electronic, electrical, mechanical, and other equipment.