The past decade has been a rollerocaster for investors in the stock market. Brokers, traders and ordinary investors watched in anguish the rise and fall of the market on a daily basis. But, as the fifth volume of Acuity explains, investors adopting a highly diversified,risk-assessed and evidence-based approach can sleep soundly in their beds, safe in the knowledge that they have a low-cost, long-term strategy that works for them.