Alternative-A was tasked with purchasing a design from either the UK or USA of roughly 50 tons but mounting a heavier gun than the British QF-20 Pounder of their existing Centurion fleet while Alternative-T was to procure a lighter design of 30 tons with less protection but more mobility. 4/?

in 1956 however Sven Berge of the Swedish Arms Administration proposed Alternative-S, a much different solution to the problems faced by the Swedish ground forces, as part of the centurion purchase the UK had provided volumns of data from World War II and Korean War tank engagements. 5/?