A versatile production system produces different kinds of products in small quantities.The system includes production lines for assembling parts into different kinds of products, testing the assembled products, and conveying the products that have passed the tests to a collective packing terminal.Each production line has a pallet feeder for feeding pallets one by one to the start of the production line.Each production line has a bypass structure. The bypass structure includes a first switcher, a main line, a bypass line, and a second switcher.The first switcher determines whether or not a product conveyed on a pallet must be repaired or tested, and according to the determination, switches the pallet and product from the production line to one of the main and bypass lines.The main line receives pallets and products switched thereto by the first switcher and conveys same. The bypass line receives pallets and products switched thereto by the first switcher and conveys them slower than the main line, or temporarily stops them.The second switcher switches pallets and products from the main and bypass lines to the production line.The collective packing system packs products conveyed on pallets and returns the emptied pallets to the respective production lines.