Survey instruments are commonly used to obtain self-reported data from persons responding to survey questions. With the growing use of mobile devices, many surveys are now administered through survey instruments running on smartphones (mobile survey instruments). A key concern over mobile survey instruments is the design of the smartphone screen (user interface) because it can have a significant impact on response quality. The user interface of a mobile survey instrument is where survey responses are made. An inappropriately designed user interface can introduce measurement errors by influencing respondents’ perception (acquiring information of survey questions) and action (entering responses). Optimizing the mobile survey instrument’s user interface is thus crucial for reducing measurement errors. In an attempt to reduce measurement errors and to improve respondents' experience, four standards and 30 guidelines for mobile survey design are proposed in this document. All the standards and guidelines are based on empirical evidences. The target readers of this document are survey researchers and practitioners.