Recruitment. Possible participants are approached through presentations at various events and ads in the media. Those interested in using the application are asked to provide their contact details and are subsequently contacted via e-mail, at which point the enrollment procedure is described. Initially, possible participants are invited to access the study's website and, after carefully reading the information package and informed consent, instructions to create an online account are given. The participants are then asked to answer a few demographic questions and complete the PHQ-9, to determine their eligibility for further evaluation. If eligible, a screening procedure is implemented. A short telephone interview screens out individuals whose participation in the study is motivated by problems other than their mood. Applicants who do not meet the inclusion criteria are informed via e-mail, thanked for their interest, given a summary score and interpretation for their PHQ-9 score. Applicants are encouraged to discuss their problems with a professional, if necessary. Information on how to reach one - a clinical psychologist or psychotherapist - is also provided. Licensed, certified clinical psychologists recruit prospective participants into the study. Media avenues (e.g., social networks, dedicated websites) are used for recruitment purposes. Additionally, clinicians from the private practice area are contacted for referrals.