Chartered Psychologist and Lecturer (PhD)

Internet Disorder Scale-Short Form (IDS9-SF)

The IDS9-SF was developed by Dr. Halley Pontes in order to assess Internet addiction and its symptoms according to the nine Internet Gaming Disorder (IGD) criteria.

Internet Disorder Scale-Short Form (IDS9-SF)


The IDS9-SF (Pontes & Griffiths, 2016) was developed by Dr. Halley M. Pontes during his PhD. This psychometric test was created with collaboration of Dr. Mark D. Griffiths at Nottingham Trent University. The IDS9-SF was developed in a study that involved the participation of 1.100 English-speaking Internet users.

The IDS9-SF is unidimensional and has a total of 9 items. This scale was developed to assess Internet addiction and its symptoms according to the nine Internet Gaming Disorder (IGD) criteria as suggested by the American Psychiatric Association in the latest edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5).

  • Psychometric properties: The IDS9-SF has been shown to exhibit adequate levels of validity as assessed by means of: (i) factorial validity, (ii) nomological validity, (iii) concurrent validity, and (iv) criterion validity. The IDS9-SF has also been shown to be reliable according to several indicators of reliability [all information about the validity of the scale can be found in the original study]

So far, the IDS9-SF has been only validated in the following languages:

If you wish to further develop and validate the IDS-15 in another language, please do get in touch with Dr. Halley M. Pontes by email: contactme@halleypontes.com.