Logotherapy can help people find their meaning in life and help people reduce their suicidal ideation. Suicide was the second leading cause of death for 15-24 year-olds. Logotherapy can increase exploration of meaning in life for adolescents and prevent them from attempting suicide. However, most research only explored the effects of logotherapy on meaning in life and depression in adolescents with mood disorders. There is a lack of research to explore the effects of logotherapy on anxiety and suicidal ideation in adolescents. Therefore, this study will explore the effects of logotherapy on meaning in life, depression, anxiety and suicidal ideation in adolescents with mood disorders. This study will carry on for two years and the sample will be recruited from the adolescents' outpatient clinic of psychiatric department in hospitals. The first and second year of the study will use a single-blind randomized controlled trial approach, the aim is to evaluate the short-term and longitudinal effects of logotherapy meaning in life, depression, anxiety and suicidal ideation in adolescents with mood disorders, the sample will collect 120 adolescents with mood disorders, and will use four instruments for testing the logotherapy intervention. The four instruments are: (1) Purpose in life Test, (2) Beck Depression Inventory II, (3) Beck Anxiety Inventory, (4) Beck Scale for Suicide Ideation. Data will be analyzed using the Statistic Package for the Social Science. The result of this study will be applied to the mental health team in the clinical psychiatric department for taking care of patients, and help adolescents with mood disorders to find their meaning in life, further, to reduce their depression, anxiety and suicidal ideation.

Logotherapy can help people find their meaning in life and help people reduce their suicidal ideation. Suicide was the second leading cause of death for 15-24 year-olds. Logotherapy can increase exploration of meaning in life for adolescents and prevent them from attempting suicide. However, most research only explored the effects of logotherapy on meaning in life and depression in adolescents with mood disorders. There is a lack of research to explore the effects of logotherapy on anxiety and suicidal ideation in adolescents. Therefore, this study will explore the effects of logotherapy on meaning in life, depression, anxiety and suicidal ideation in adolescents with mood disorders. This study will carry on for two years and the sample will be recruited from the adolescents' outpatient clinic of psychiatric department in hospitals. The first and second year of the study will use a single-blind randomized controlled trial approach, the aim is to evaluate the short-term and longitudinal effects of logotherapy meaning in life, depression, anxiety and suicidal ideation in adolescents with mood disorders, the sample will collect 120 adolescents with mood disorders, and will use four instruments for testing the logotherapy intervention. The four instruments are: (1) Purpose in life Test, (2) Beck Depression Inventory II, (3) Beck Anxiety Inventory, (4) Beck Scale for Suicide Ideation. Data will be analyzed using the Statistic Package for the Social Science.

The research process includes:

1. Participant acceptance and signing consent: Referral by doctors from Chang Gung Hospitals and National Taiwan University Hospitals. Full-time research assistants will explain the purpose of the research, the research process, the confidentiality of data processing, and allow the individual to freely decide whether to participate without being forced, obtaining a signed consent form. Those who are under twenty-years-old will also obtain the consent of the legal representative.
2. Pre-test: data collectors blinded single-blind study, the work-students who did not participate in the intervention measures will collect the patient's basic data sheet and four scales.
3. Random assignment: The psychologist (co-host) randomly assigns the cases to the experimental group or the control group, and assigns the groups by means of a computer-generated random assignment table.
4. Intervention: The experimental group received 6 interventions of logotherapy given by a full-time assistant, while the control group received routine outpatient treatment of general adolescent psychiatry.
5. Posttest: Both the experimental group and the control group will collect the same four scales three times by the work-study students.

The result of this study will be applied to the mental health team in the clinical psychiatric department for taking care of patients, and help adolescents with mood disorders to find their meaning in life, further, to reduce their depression, anxiety and suicidal ideation.

Inclusion Criteria:

• Patients with mood disorders (such as depression, bipolar disorder) diagnosed by a psychiatrist.
• Patient Health Questionnaire-9 items (PHQ-9) score 5-19 points (indicating mild depression to moderate to severe depression)
• Agree to participate in logotherapy
• Able to participate in logotherapy

Exclusion Criteria:

• Patients with severe emotional disorders who cannot participate in logotherapy.
• Those who have severe psychopathological phenomena and cannot judge reality or those who are mentally deficient.
• Those who have serious suicidal ideation or clear suicide plan are not suitable for interview