The IAT was the first validated instrument for the assessment of internet and computer addiction. A study by Kimberly Young (cited below) found that the IAT is a reliable measure, covering the most important elements characteristics of pathological internet use.

Using this scale of 5 choices, answer how often the questions below apply to your online behavior:

  Rarely or never Every once in awhile Sometimes Often Always
1. Do you find that you stay online longer than you intended?
2. Do you neglect household chores to spend more time online?
3. Do you prefer the excitment of the internet to intimacy with your partner?
4. Do you form new relationships with fellow online users?
5. Do others in your life complain to you about the amount of time you spend online?
6. Does your work suffer because of the amount of time you spend online? (E.g., postponing things, not meeting deadlines, etc.)
7. Do you check your email before something else you need to do?
8. Does your job performance or productivity suffer because of the internet?
9. Do you become defensive or secretive when anyone asks you what you do online?
10. Do you block disturbing thoughts about your life with soothing thoughts of the internet?
11. Do you find yourself anticipating when you will go online again?
12. Do you fear that life without the internet would be boring, empty or joyless?
13. Do you snap, yell, or act annoyed if someone bothers you while you are online?
14. Do you lose sleep due to late night internet use?
15. Do you feel preoccupied with the internet when not online, or fantasize about being online?
16. Do you find yourself saying "Just a few more minutes" when online?
17. Do you try to cut down on the amount of time you spend online and fail?.
18. Do you try and hide how long you've been online?
19. Do you choose to spend more time online over spending time out with others?
20. Do you feel depressed, moody, or nervous when you are not online, and do these feelings go awhile when you go back online?
Sources
  1. Kimberly S. Young. Internet Addiction: The Emergence of a New Clinical Disorder. 1(3) Cyberpsychol & Behav 237-244. .
  2. Laura Widyanto & Mary McMurran The Psychometric Properties of the Internet Addiction Test. 7(4) Cyberpsychol & Behav 443-50. .