Bandwidth, community, and location are three factors your UX team should consider before creating a prototype to test in the field. On a research trip in India, a Google designer learned firsthand how these variables affect the way people respond to technology. In one instance, he shared his mobile phone with a local fruit vendor for feedback on a prototype, but instead of evaluating the design, the vendor was distracted by the phone’s bright contrast and uncracked screen. The context influenced the vendor’s response because he’d owned a second-hand phone with a broken screen for several years. Learning from this experience, the designer might instead begin by testing a paper prototype to help research participants focus on the design, rather than the device.Product teams develop prototypes to test ideas and designs directly with users. In the beginning phase of product development, most designers create low-fidelity paper prototypes using sketch pads, sheets of plain paper, and markers. As teams gain confidence in their concepts, designers create and test high-fidelity digital mockups. This workflow is typical in many contexts, but there are special considerations if you’re building global products.