Students in the Analytical II (Instrumental Analysis) course disassemble a decommisioned GCMS.  After having general instruction on the design of GCMS systems, the students had a great time finding all of the important components discussed in class.  The activity helps the students to see the physical relationships between each of the main components and any unique engineering challenges that had to be overcome in its design.  After isolating the mass analyzer and detector, the students were able to successfully reassemble the instrument by the end of class.