“…Randomised response techniques developed very strongly in the 21 st century. Theoretical developments include much more complicated models (Abdelfatah, Mazloum, 2015;Batool, Shabbir, Hussain, 2017), optional randomised response techniques (Khalil, Zhang, Gupta, 2021) and scrambled randomised responses (Vishwakarma, Singh, 2021). Applications of RRTs include research on inappropriate sexual behaviour (Rueda, Cobo, López-Torrecillas, 2020), illegal waste disposal (Chong et al, 2019), ethics in business (Chu, So, Chung, 2018), corruption (Gingerich, 2010), and many more.…”