The Rich Dad series, begun in 1997, is based on Kiyosaki’s childhood observations of the lessons passed down by his father, a well-educated wage slave, versus those of his closest friend’s father, an eighth-grade dropout and multimillionaire. The difference, he determined, is that the poor and middle class work for money, but the rich let money work for them. The wisdom passed on by the rich dad is a type of financial literacy that is never taught in schools. Kiyosaki also developed a board game, Cashflow 101, which is used in his seminars to generate ideas on how to achieve financial independence.