In engineering economy, when comparing alternatives, it is permissible to use any of the PW (Present Worth), FW (Future Worth), or AW (Annual Worth) methods, even if the problem does not specify which to use. Each method serves to evaluate the financial viability of alternatives by providing a comparable value. The choice of method may depend on the specific context or preference, but they all lead to the same conclusion regarding the best alternative. Understanding the definitions and applications of these methods is essential for effective analysis. Ultimately, the key is to ensure that the chosen method aligns with the comparison objectives.
