Which describes the process of diagnosing an organization's external and internal environments, including deciding on a vision and mission?

Strategic planning

Explanation:

Process to identify the external and internal conditions of the organisation, determine a strategy and goal, formulate general goals, establish and choose general approaches, and allocate resources for the organization's objectives.

Strategic planning is the method of documenting and guiding the small company - by evaluating where they are and where they're going. The strategic plan actually provides them with the opportunity to record the mission, vision and principles and their lengthy-term goals and intervention plans to achieve them.