Frequent sitting for prolonged periods, using hands/fingers requiring dexterity and coordination to handle files and single pieces of paper, reaching with hands and arms for items above and below desk level, talking, hearing, and seeing (up close, at a distance, along the periphery, with depth perception, and the ability to adjust focus); walking from place to place within the office with occasional use of stairs and no elevator available; bending, pushing, pulling, and standing for up to 2 hours; occasional lifting of up to 25 pounds such as small office equipment, files, stacks of paper, reference and other materials. Process vendor/subcontractor invoices for payment by making comparisons to purchasing orders/subcontracts, and material receiving reports to verify quantities, prices, payment terms, and freight charges within procurement guidelines.