The whole PDCA cycle in Toyota is given in an A3 sheet so that at any point of time it is easy to trace the genesis of the improvement, how it started, what were the iterations involved, who all contributed, what were the cost savings involved at each stage. It is a living document which will undergo change in the future cycles of improvement. etc..
The PDCA concept can be best explained with the help of this game.
Repeat the steps given earlier. In the check phase, check whether all teams have equal value of cards. If not repeat the PDCA cycle a third time and so on till all the teams have equal value of cards with it.
This is a game which gives you the meaning of what is PDCA cycle and tells how how to use the PDCA cycle repeatedly for continuous improvement.