What is a written plan that outlines a problem to be solved, including its criteria and constraints?

A written plan that outlines a problem to be solved, including its criteria and constraints, is best described as a design brief. A design brief serves as a foundational document that helps guide the creative process. It clearly defines the issue at hand, outlines specific goals to be achieved, and identifies any constraints that must be considered, such as time, budget, and resources.

A design brief is particularly useful in design and engineering contexts, where a structured approach is crucial for addressing complex problems effectively. It helps ensure that all stakeholders have a common understanding of the project requirements, fostering alignment and focus during the development process.

In contrast, a project proposal is typically aimed at securing approval and funding for a specific project; it presents ideas and benefits but may not delve as deeply into the specifics of the problem criteria and constraints. A strategic plan outlines long-term goals and the approach to achieving them but does not necessarily focus on a singular problem. A business model describes how a company creates, delivers, and captures value, which is broader and more focused on operational aspects rather than problem-solving criteria.