Note that your strategy for discovering requirements is affected by the decision to use
OTS software. In this situation you investigate the work context in parallel with
making comparisons with the capabilities of the OTS product. Depending on the
comprehensibility of the OTS software, you might be able to discover the matches or
mismatches without having to write each of the business requirements in atomic
detail. The mismatches are the requirements that you will need to specify so that you
can decide whether to satisfy them by either modifying the OTS software or
modifying the business requirements