Hagar, I've always taught this as four steps, but I found this at answers.com and am copy pasting it here to help you out:

1. Understand the Problem

2. Collect Information

3. Form a Hypothesis

4. Test Hypothesis

5. Keep Accurate Record

6. Check Results

7. Repeat Experiment

8. Confirm Conclusion

9. Communicate Results

10. List New Problems that Arise