Upon completing Learning Module IV, you have documented procedures for applying MEKC for qualitative and quantitative analysis using capillary electrophoresis. Following the separation you completed in step 3, consider whether you would revise any of the protocol you developed in this Learning Module. Now that you are familiar with the parameters necessary to determine retention factor consider how you might design an experiment to determine the retention factors for a series of similar analyte, perhaps cationic compounds. Take a look at the answer key we have provided for Learning Module IV. If you are in contact with other researchers who have completed this Learning Module, you should consider sharing your responses with others. You may find subtle differences or explanations that you find useful.