As part of his research evaluating a short-term intervention to develop Calculus skills, Professor Lee administers a Calculus test to participants and 2 weeks later administers another version of the test, with different but comparable items, to the same participants. What type of reliability is Professor Lee demonstrating for his test results? If Professor Lee gave the same version of the Calculus test to partici- pants at both time points, with a greater period of time in between the tests, what type of reliability would he be demonstrating for his test results then?