Main
Open data files for input
IF either file could not be opened
     Terminate program
Print heading
Get data for a Store 1 department
Get data for a Store 2 department
WHILE NOT EOF on file store1 AND NOT EOF on file store2
     Print data for the Store 1 department
     Print data for the Store 2 department
     Get data for a Store 1 department
     Get data for a Store 2 department