What are the three main features of an online survey that makes it effective?

The three main features that make an online survey effective are user-friendly design, clear and concise questions, and mobile responsiveness. A user-friendly design ensures participants can navigate the survey easily, while clear and concise questions enhance understanding and reduce ambiguity. Mobile responsiveness allows respondents to complete the survey on various devices, increasing participation rates and reaching a broader audience. Together, these features improve response quality and overall engagement.