To determine how well an investment is doing, it is important to take into account its return and risk. Rational investors seek to obtain the highest amount of return from an investment with the least amount of risk. The CAPM and the arbitrage pricing theory are alternative methods of identifying the risk and return relationship in an investment or groups of investments. What are the similarities and differences between the two models? In your opinion, which model would be most appropriate for evaluation of a portfolio of investments? Why? Which method would you recommend for a single investment project? Why? Provide your rationale using examples.