Which of the following is an example of a design tool?

A design tool is used to help visualize, organize, and represent information or processes in a structured manner. IPO charts, which stand for Input-Process-Output charts, serve as a powerful design tool because they illustrate how data flows through a system, highlighting the inputs, the processes involved, and the resulting outputs. This visualization assists in understanding and improving systems, making it an effective method for designing workflows or processes.

While charts can provide visual representations of data and text documents can convey information, they do not specifically serve the purpose of outlining a process's structure in the same way that IPO charts do. Sworn statements are legal documents that validate facts, but they do not function as design tools in the context of data analysis or process design. Therefore, IPO charts are distinctly positioned as a design tool within the provided options.