attract surveyees from a "highly selective subgroup of the general population" whereby all respondents have a specific 'similar' demographic, economic status, values and habits, which can affect the randomization of participants selected within the sample. As noted by social scientist Helen Ball, "It is not easy to use random sampling techniques with online surveys as there is no systematic way to collect a traditional probability sample of the general population using the internet" To overcome these issues, Google has introduced measures to enhance survey credibility and reliability. Addressing the concern regarding participants attentiveness, Google has introduced 'Attention checks' to deter careless responding behavior and forging of data. Google tests attentiveness by asking specific questions to ensure the surveyee is paying attention when taking surveys. Such questions include asking the surveyee to choose a specific choice from the multiple choices offered to ensure the question is read. If such questions are answered incorrectly the users account will be flagged and the user will receive fewer surveys. This action has increased researchers' confidence in the quality of their results and the "internal validity of the research." Furthermore, the simple, "fast and easy" design adopted by Google for the online surveys has been recognised by economists Riccardo Vecchio, Gerarda Casoa, Luigi Cembaloa and Massimiliano Borrelloa as an effective display to ensure questions are understood and answered correctly, further enhancing the reliability of the results. They state, "After beginning a survey, Google Opinion Rewards presents only one question to the user at a time, and they are only presented with the next question when they have answered the one presented to them. The presentation of each question is plain to ensure minimal misinterpretation of individuals in the user base." Privacy and security of surveyee information Privacy and security of surveyee information are of concern as Google Opinion Rewards collects information about the surveyee including their name, age and location in addition to the information provided in their responses. While Google has been criticized for collecting data of users such as with their Screenwise Meter, people are generally aware that Google collects data, which Google claims is for the purpose of improving their services, however, users are worried their data would be sold to and accessed by other parties which may use the data for nefarious purposes or even spamming and targeted advertising. While adding this information online provides a form of transparency, contention remains