According to the BABOK® Guide, the solution approach process is the process of defining the most feasible and appropriate approach to deliver a solution that meets the business need and satisfies the stakeholders. The three inputs needed to determine the solution approach process are:

Business need: the problem or opportunity that the organization wants to address with the solution.

Organizational process assets: the policies, procedures, standards, guidelines, and templates that are relevant to the solution approach process.

Required capability: the set of capabilities that the solution must provide to meet the business need and the stakeholder requirements.

References: BABOK® Guide, page 36; Business Analysis Expert Certification, CCBA® | IIBA®, section “What Should I know to be CCBA Certified?”