This class provides a hand on exercise of the CUPID code. There will be a CUPID user guide before the exercise, which includes description of the major input, calculation mesh input, and output processing. A CUPID executable will be available with limited approval for the class so that the students could run the CUPID code if they bring their lap top computers. A set of test problems will be provided for the exercise with the description of the problem definition and relevant input parameters. The test problem includes single/two-phase flow verifications and validations against experiments related to nuclear thermal hydraulics.