The primary aim of this study is to examine the efficacy of a self-guided Internet-delivered intervention for coping with ADHD. The secondary aim is to investigate the effects of individual adaptation of the intervention on adherence, satisfaction and clinical outcomes.

ADHD in adulthood, with an estimated prevalence of 2 - 3 %, is associated with challenges in daily life functioning. The availability of evidence-based psychological interventions for adults with ADHD is poor. Interventions delivered over the Internet might help to increase the availability of effective psychological interventions for this group. The primary aim of this study is to examine the efficacy of a self-guided Internet-delivered intervention for coping with ADHD. The secondary aim is to investigate the effects of individual adaptation of the intervention on adherence, satisfaction and clinical outcomes. A minimum of 118 participants with a self-reported ADHD diagnosis will be included in the study. In phase 1 we will conduct a randomized controlled trial with two arms, 1) self-guided Internet-delivered intervention for coping with ADHD (N=59), 2) self-guided online psychoeducation (control group, N= 59), with a 3 month follow-up. After 3 months the second phase of the study starts. In this phase (II) the control group participants will receive an adaptive version of the Internet-delivered intervention. This includes adaptation of the order of the modules to the individual participant needs, with the use of rule-based and machine-learning based adaptation. Clinical outcomes in both phases are inattention, hyperactivity, quality of life and stress. Uptake, usage, adherence and satisfaction will be explored. Repeated measurers are at baseline, weekly during the intervention period, post-intervention and 3 months follow-up.

Inclusion Criteria:

1. Adults with a self-reported diagnosis of ADHD (date, venue and diagnosing physician)

2. Access to and ability to use a computer, smartphone and the Internet.

3. Current problems with organizing daily activity and 17 points of more on at least one of the ASRS subscales

4. Participant are by investigators considered able to follow through the training protocol and take part in measures taken during the study time frame

5. Speaks, writes and reads Norwegian

   Exclusion Criteria:

6. Current self-reported diagnosis of severe psychiatric illness such as borderline or antisocial personality disorder, bipolar disorder, ongoing substance abuse, and/or suicidal ideation assessed with item 9 on the MADRS

7. Participants who are taking prescribed ADHD medication have to be stable on the medication at least four weeks before the study and during the study.