Perceive cases, case cutter edge, case strips, shelf location, product size/ description, equipment controls, case load limits, price marking equipment, department production equipment, customers, co-workers, shelf tags, labels on products, stocking carts, temperature gauges/controls, invoice/packing slip, code date, reports, packaging materials, debris on floor, aisle markers, and signs. 3. Ability to make judgements concerning the placement of merchandise on the shelf/display (spatial relationship), case opening procedures, extent of unsalable product damage, conversation with customers, selling of product, display of product, use of packaging materials for product, quality of product for display and ordering of processed items .