Running Quickcheck On Linux: You have two options. 1. download the QCheck library from http://comsci.liu.edu/~league/dist/qcheck/qcheck-1.0.tar.gz untar it into (on my machine =~/teaching/fps/) cd /qcheck-1.0 make -f Makefile.moscow . . compiles .ui/.uo files in src subdirectory . mosml -I /qcheck-1.0/src then you can use command "load QCheck" in interpreted files or in the interpreter. 2. follow instructions for Windows users. On Windows: Since the moscow ml interpreter and compiler have problems with filenames on Windows I had to modify all of the source filenames in the QCheck package and recompile. I have created a zip file of the compiled src directory with the modified filenames. qcheck-1.0-win.zip Note that this is not the entire QCheck distribution but only the files you need. On windows you can use explorer or other mechanism to unzip this into some directory. Now if you want to use it you will need to give mosml the -I option to find these files mosml -I \qcheck-1.0-win (on my windows machine is c:\moscowml\) then you can use command "load Qcheck" in interpreted files or in the interpreter. Note the different name!! The module file is Qcheck.ui, not QCheck.ui as in the Linux version.