This document discusses the internal rate of return (IRR) method for evaluating investment projects. It defines IRR as the discount rate that makes the net present value equal to zero. Projects with an IRR higher than the required return would be accepted. IRR is generally reliable for conventional cash flows but can produce unreliable results for non-conventional cash flows or when comparing mutually exclusive projects. The document also notes some advantages and disadvantages of using IRR, such as its intuitive appeal but potential to produce multiple answers or inability to rank mutually exclusive projects.