The standard of care plus resource interview group (STAR) will be offered a clinical interview, a risk assessment, and a non-specific resource focused intervention over three face-to-face sessions. In this resource focused intervention, the patient is asked to name her*his resources, describe them, and give examples.

The Stroop task is a cognitive psychology test that evaluates an individual's ability to selectively attend to information while inhibiting interference from irrelevant stimuli. The Stroop task measures the time taken to complete tasks and the accuracy of responses. The primary measures are the time taken to complete the task and the number of errors. Lower completion times and fewer errors indicate better cognitive control and attentional focus. Lower scores (faster completion times and fewer errors) are associated with better outcomes, reflecting more efficient cognitive processing and interference control. Higher scores, if used to quantify errors or time taken, are associated with a worse outcome, indicating greater interference and potentially reduced cognitive control.

The General Self-Efficacy Scale (GSE) is a 10-item self-report questionnaire to assess the general sense of self-efficacy. Items are rated from 1 (do not agree) to 4 (totally agree). A higher score indicates a stronger belief in one's ability to cope with and navigate different situations.

The Internal-External Locus of Control Short Scale-4 (IE-4) is a brief measure designed to assess an individual's locus of control orientation. Locus of control refers to the extent to which individuals believe they control events in their lives. The IE-4 is typically scored by summing the responses to its four items, each rated on a Likert scale. The possible score range is determined by the specific scoring method researchers or practitioners use. The scores may range from 4 to 16, depending on the scoring system employed. Higher scores on the IE-4 may suggest a more internal locus of control, indicating a belief that one has control over their life events. Lower scores may indicate a more external locus of control, suggesting a belief that external factors or luck play a significant role in life events.

The Mee-Bunney Psychological Pain Assessment Scale (MBPPAS) is a 10-item self-report scale to assess intensity and frequency of psychological pain. Psychological pain is defined as an experience of unbearable agony which can be linked to a psychiatric disorder.

The Self-Injurious Thoughts and Behaviors Interview (SITBI) is a structured interview that assesses the presence, frequency, and characteristics of a wide range of self-injurious thoughts and behaviors, including suicidal ideation, suicide plans, suicide gestures, suicide attempts, and nonsuicidal self-injury. We will draw on selected questions from this interview and apply them in the form of a questionnaire.

The Beck Scale for Suicide Ideation (BSS) is a self-report questionnaire with 21 items. The BSS measures the ideation (suicidal thoughts, plans and suicidal feeling) of suicide.

The Sociodemographic Questionnaire (DEMO) is a 30-item questionnaire that was developed to collect sociodemographic (e.g., gender, socioeconomic status, professional status, relationship satisfaction) and health-related data (e.g., medication, inpatient and outpatient treatment).

The Mini-DIPS is a short, structured clinical interview for diagnosing mental disorders and is based on the DIPS-OA. The Mini-DIPS allows for a quick yet reliable diagnosis. It is applicable in adulthood and captures lifetime diagnoses, current and past diagnoses, based on the criteria of DSM-5 and ICD-10. The Mini-DIPS covers the mental disorders most commonly observed in clinical settings.

The Beck Depression Inventory (BDI-II) is a self-assessment questionnaire and contains 21 items which assess the severity of depressive symptoms. A participant's score is calculated by summing up the scores from each item. The total score ranges from 0 to 63. Values between 0 and 11 lie within the norm, between 11 and 17 moderate depressive symptoms and a total score up to 18 is assessed as a clinically relevant depressive disorder.

The Three-Item UCLA (University of California, Los Angeles) Loneliness Scale is a short questionnaire with three items from the Revised UCLA Loneliness Scale (R-UCLA). These items can be rated from 1 (hardly ever) to 3 (often). A higher score indicates a higher level of perceived loneliness. The scale is designed to measure subjective feelings of loneliness, so individuals who score higher on the UCLA Loneliness Scale report more frequent experiences of loneliness and social isolation.

The Working Alliance Inventory - short revised (WAI-SR) in German is an empirically validated and economic instrument to assess the therapeutic alliance.

The Bochum Change Questionnaire 2000 (BVB-2000) is a direct self-report assessment for therapeutic change.

The Questionnaire for the evaluation of psychotherapy processes (FEP-2) assesses four dimensions of therapeutic outcomes (Well-Being, General symptoms, Incongruence and Interpersonal problems).

Adherence and Competence Scales, element 1-5 (ACS). The ACS scales were developed using the ASSIP criteria.

Electrodermal activity (EDA), also known as skin conductance or galvanic skin response, is a valuable physiological marker in suicide research. EDA measures the skin's electrical conductance, reflecting sympathetic nervous system activity. Suicidal individuals often experience heightened emotional distress and arousal, challenging assessment via self-reports alone. EDA offers an objective, non-invasive means to quantify this emotional response, with distinct patterns observed in those at risk of suicide.

Real-time measurement of patients' risk factors using a phone app M-path. A 14-items questionnaire which is filled out 5 times a day.

The D2 Test of Attention and Concentration is a neuropsychological test used to assess selective and sustained attention. It is employed to evaluate an individual's visual scanning, concentration, and information processing speed. The D2 Test involves scoring based on the number of correctly marked items minus the number of errors. The scoring method considers both the quantity and accuracy of responses. The goal is to mark as many target items as possible within a specified time limit while avoiding errors. A higher score is considered a better outcome, indicating more correct responses and effective attention and concentration.

The German Dissociation-Tension Scale - 4 (DSS-4) is a four-item brief self-report instrument to assess dissociation. It was developed based on the DSS-acute, a longer scale to measure dissociative symptoms. The four DSS-4 items assess somatic and psychological dissociation and each item is rated on a 10-point Likert scale ranging from "not present" = 0 to "very strong" = 9. Based on the DSS-4, a dissociation score per participant is calculated as the mean of the four items.

The Incongruence Questionnaire (INK) measures unsatisfactory realization of motivational goals, whereas the personal relevance of motivation is measured in the FAMOS. The questionnaire INK assesses the realization of approach and avoidance goals on 14 and 9 scales, respectively, with a total of 94 items. Each item to assess approach goals is assessed on a five-point Likert scale. For each scale, the mean value of the corresponding item values must be determined. In addition, it is possible to calculate three composite scales: 1) incongruence with avoidance goals; 2) incongruence with approach goals; and 3) total incongruence.

The Questionnaire for the Analysis of Motivational Schemas (FAMOS) assesses the motivational goals of psychotherapy in terms of central components of motivational schemas in self-report format. The questionnaire FAMOS assesses motivational goals as approach goals on 14 scales and avoidance goals on 9 scales, with a total of 94 items. Each item is rated on a five-point Likert scale. For each scale, the scale mean of the corresponding items is calculated. In addition, three summary values can be calculated: 1) total value for approach goals; 2) total value for avoidance goals; and 3) the ratio of avoidance to approach goals.

Coping with suicidal ideation and behavior will be assessed with the Suicide-Related Coping Scale (SRCS). The self-report scale SCRS consists of 17 items, with each rated on a five-point Likert scale from "strongly disagree" = 0 to "strongly agree" = 4. A total SRCS sum score is calculated by inverting the negatively worded items and then summing the 17 items. A higher sum score indicates better suicide-related coping.

The Alcohol Use Disorders Identification Test (AUDIT-C) is an alcohol screen that is used to identify patients who are hazardous drinkers or who may have an active alcohol use disorder. The minimum score (for non-drinkers) is 0, and the maximum possible score is 12. The higher the AUDIT-C score, the more likely it is that the patient's drinking is affecting their health and safety.