F_ _ _ _ _ _ _ _ _ _ study is a research process that finds out whether or not a design will work.

The term you are looking for is "feasibility study." A feasibility study is a comprehensive evaluation conducted to determine the viability of a proposed project or system. It assesses various factors such as economic, technical, legal, and operational aspects to ascertain whether the design or plan is likely to be successful.

In a feasibility study, researchers gather data, analyze potential risks, and consider financial implications to identify whether it is practical to proceed with the project. This study serves as a decision-making tool for stakeholders by providing insights into the strengths and weaknesses of the proposed initiative. Essential components of a feasibility study include market research, cost analysis, and an examination of logistical requirements. Ultimately, the goal is to provide a well-informed recommendation on whether to move forward or abandon the proposed design.