Source: https://www.ets.org/Media/Research/pdf/RM-18-01.pdf (see pp. 7-8)
References
https://www.cal.org/flad/tutorial/reliability/3andvalidity.html
https://www.thegraidenetwork.com/blog-all/2018/8/1/the-two-keys-to-quality-testing-reliability-and-validity
