Why is it important to operationally define variables?

In this unit, you will begin to work with your instructor to develop an area of interest and start designing a psychological research study. Review the Final Course Paper Instructions and Grading Rubric. Final Course Paper Instructions and Grading Rubric. – Alternative Formats The topic of your study should be one which you found interesting during your study of psychology. You must gain approval of your research area during this first unit. Please be sure to pick a topic in which you will be able to find enough information to meet the requirements.
For this discussion, please complete the following:

Identify a topic that you find interesting..
Is this topic well researched, and is there great deal of information drafted about it?
Be sure your topic is as focused and specific as possible. Think about using one of these types of format: 1) The effects of _ on _ OR 2) What is the relationship between _ and _?
Why is it important to operationally define variables? Thinking about the topic you chose, what might be the variables you would use in your study? Try to identify at least one independent variable and one dependent variable, and provide an operational definition for each.