Things to Know:
You can have more than one DV in a true experiment. If you do - there are advanced statistical techniques such as the Multivariate Analysis of Variance (MANOVA) that will handle this for you.

If you use a repeated Measures Design, you have to take into account order or practice effects. Common solutions are:

• Block Randomizations:
  Orders of conditions randomized with all occurring before any repetitions
  
  
• Reverse Counterbalancing:
  ABBA or ABCCBA orderings of treatment levels.
  
  
• Latin Squares Techniques:
  A B C D
  B C D A
  C D A B
  D A B C