This document discusses various methods used to evaluate and choose innovation projects. It begins by explaining that developing new products and services is risky and expensive, so firms must choose projects carefully. It then covers quantitative methods like net present value (NPV) and internal rate of return (IRR) analysis, which convert projects into estimates of future cash flows discounted to the present. It also discusses real options analysis and capital rationing, where firms set R&D budgets. While quantitative methods provide concrete comparisons, the estimates used are uncertain, especially for new technologies. The document advocates combining quantitative and qualitative techniques to evaluate projects.