@article {778, title = {A comparison of the performance of simulated hierarchical and linear testlets}, journal = {Journal of Educational Measurement}, volume = {29}, year = {1992}, pages = {243-251}, author = {Wainer, H., and Kaplan, B. and Lewis, C.} } @article {781, title = {Building algebra testlets: A comparison of hierarchical and linear structures}, journal = {Journal of Educational Measurement}, volume = {8}, year = {1991}, pages = {xxx-xxx}, author = {Wainer, H., and Lewis, C. and Kaplan, B. and Braswell, J.} } @booklet {1554, title = {Some empirical guidelines for building testlets (Technical Report 91-56)}, year = {1991}, address = {Princeton NJ: Educational Testing Service, Program Statistics Research}, author = {Wainer, H., and Kaplan, B. and Lewis, C.} }