Field testing is a research method used to evaluate the performance, effectiveness, or usability of a product, service, or intervention in real-world settings. This type of testing allows researchers to gather data on how the subject performs in the actual environment it will be used in, rather than in a controlled laboratory setting. Field testing is often conducted to assess the feasibility, acceptability, and impact of a new technology, program, or intervention before it is implemented on a larger scale. This method is commonly used in fields such as education, healthcare, agriculture, and technology development.