With growing waiting lists in specialized youth mental health care (sGGZ) and shortages of care staff, finding creative solutions to respond to this scarcity issue is important. Online treatment is an example of this, which, especially for young people growing up in a digital age, can be an appropriate and accessible alternative to treatment at a physical location. Online treatment via video calling among youth, while researched and proven effective in a blended form, has not yet been sufficiently researched as a complete replacement for treatment at a physical location. As a result, the potential added value of online treatment for the pressing scarcity issue in healthcare is not yet sufficiently clear.

This study therefore focuses on investigating the effectiveness of fully online treatment using two proven effective interventions: Eye Movement Desensitization and Reprocessing (EMDR) and Acceptance and Commitment Therapy (ACT) within the youth sGGZ. With the results of this research at GGZ-NHN, the investigators want to contribute to the development of guidelines and standards for the implementation of online treatments within Dutch youth mental health care.

In recent years, there has been tension between young people's need for specialty mental health care (sGGZ) and the lack of sufficient available resources and staff. As a result, waiting lists have increased. To increase the accessibility and efficiency of care, online treatment through video calling is a promising method. Online treatment can help reduce waiting lists, as there are no limitations in terms of physical space and geographical proximity to clients and health care professionals, and it allows mental health professionals to work more efficiently and reach more young people, as they have no travel time and can plan flexibly from any location. An additional advantage of online treatment is its low threshold. Young people with mental health problems often face stigma and shame for physically going to a mental health facility. Online treatment via video call can remove this barrier and allow young people to access the care they need from their familiar surroundings.

It is plausible that fully online treatment with youth is at least as effective as treatment in a physical location, regardless of cultural origin, gender, or social environment, because youth are familiar with digital communication, the technical application has now been sufficiently developed, and blended treatment has been assessed as effective in research. However, it has not yet been sufficiently scientifically studied whether fully online treatment via video calling in youth is actually a worthy alternative to physical treatment in reducing mental health problems among youth.

This research project of GGZ Noord-Holland-Noord (GGZ-NHN), on which Drs. E. te Brake will receive her doctorate, therefore focuses on the effectiveness of fully online treatment within the youth sGGZ compared to regular treatment at a physical location. This study explicitly includes a role for experts by experience who, from the perspective of clients and relatives, contribute to the design and execution of the study and the implementation of the results into treatment practice.

The proposed research includes a Randomized Controlled Trial (RCT), specifically focused on two common therapies with adolescents in the sGGZ: Acceptance and Commitment Therapy (ACT) and Eye Movement Desensitization and Reprocessing (EMDR). Cognitive behavior therapy (CBT) could be an obvious choice because of its extensive knowledge and experience, as well as available scientific evidence. But the investigators prefer the more generalist ACT because CBT uses a separate protocol for each target group. As a third-generation form of therapy, ACT is a suitable intervention because its universal protocol is applicable to a broad target group. Moreover, ACT has been shown to be not inferior to cognitive behavioral therapy in terms of effectiveness. The methodology shows significant improvements in depressive symptoms, quality of life, and perception of competence.

Treatment will be protocolized according to the guidelines prescribed by the manual for this purpose. The protocol used is specifically intended for the target group aged 15-25. However, it is known that adolescents between 12 and 15 can also benefit well from ACT. Age-appropriate adjustments in language use will be applied here. In addition, EMDR will be investigated for trauma-specific symptoms, as digital tools are available with EMDR that allow for a good comparison with EMDR in a physical location.

Because an RCT generates reliable and generalizable information, and the investigators examine two commonly used interventions in the mental health system, the study fits well with policymakers' effectiveness-evidence criteria. If it turns out that fully online treatment is a worthy alternative to treatment at a physical location, then this lays a foundation for online work. It thus contributes to the low threshold, accessibility, and affordability of youth mental health care.

Inclusion Criteria:

• Adolescents aged 12-18 years who would benefit from ACT or EMDR within the SGGZ, as determined by the screeners at registration or current primary practitioner.
• Client is stable, i.e. there is no serious crisis (to be determined by screener cq primary practitioner)
• Sufficient command of the Dutch language to complete the questionnaires.
• Client does not participate in other (intervention) studies

Exclusion Criteria:

• Clients who are crisis-prone or enter in crisis
• Clients who are in forced care (wvggz)

Male, female

Block randomization will be conducted by an independent researcher who is not involved in the study assessments or therapies. This process will assign clients to either online or in-patient treatment to ensure approximately equal distributions of individuals aged 12-15 and 15-18, as well as balanced representation of different sexes. For both video call treatment and treatment at a physical location, the waiting time until the start of treatment will be the same; treatment will begin within a maximum of 2 months from registration.