I am teaching TBL first time this term and one of my bright students suggested that I should use the same system for iRat and tRat to make the tests more fair. Currently I am using IF ATs for the tRat and for the iRat a 'hedging' system where students can allocate either 4, 3, 2 or 1 point(s) to the four alternative answers (e.g. 4 if they are certain they know the answer, 3 if they are fairly sure with 1 point on an alternative answer...). My bright student suggested to use an iRat based on preferences - such as answer a) is my first preference then c) then..... He (bright student) suggested this would more closely resemble the tRat. I am not sure that this would improve the system in any way. I would be interested in what iRat methods other people use and any thoughts on my student's suggestion.