The concept of “not in education, employment, or training” (NEET) refers to young people who do not have a job, are not engaged in education, and are not registered in an education. Therefore, the concept includes “at-risk youth” who are unemployed or inactive and do not have access to educational opportunities. The existence of NEET youth is attributable to the complexity of the transmission process between youth, difficulties related to maintaining full-time enrollment in an educational or training environment, the development of part-time and mixed business models, changes in the labor market, and difficulties in accessing existing jobs. Existing studies in this field indicate that various age groups, such as those ages 15–17, 15–19, 15–24, 15–34, 18–24, 20–24, 20–34, 25–29, are taken as a basis due to different reasons according to countries. However, the young population age group of 15–24 is mentioned most prominently in studies. However, due to the strong impact of the economic and social crises on those aged 25–29 and the problems they experience when transitioning from higher education to employment, the scope of NEET studies should be extended to include those aged 15–29, which would include the 25–29 age group. In this study, the 15–29 age group was treated as a reference group for studying NEET. This study, which is based on research findings, includes the results of profile research on young people in Turkey who are of NEET status. The paper aims to determine the causes and effects of being NEET among those aged 15–29 in Turkey. It is important that the research be based on cause-and-effect analysis that applies scientific and statistical methods for the group that is neither receiving education nor employed. The fact that the research scans and examines direct and indirect profile studies in-depth and references original studies from around the globe with its cause and effect dimensions reveals its strengths. Quantitative (survey) field research carried out within the scope of the project supported by the Ministry of Youth and Sports was carried out in 26 provinces that gave their names to the regions within the 26 sub-regions within the framework of the Turkish Statistical Regional Units Classification (NUTS) - II. It is aimed to analyze the reasons and effects of being NEET of young people residing in these provinces in the age group of 15-29. In this context, face-to-face surveys were conducted with a total of 3,100 NEET youth in and around these locations by going to the survey starting address of the households obtained from TUIK in 26 provinces, and valid questionnaire interviews were completed with 3,158 NEET youth by the end of the study. The survey results were analyzed to determine whether the questions including the causes and effects of NEET form a universal scale, and a high level of validity and reliability was obtained because of the scale development studies. This development, which is very important in terms of the scientific aspect of the subject and its contribution to the literature, has been included in the literature as an original contributions to the field. Additional field work was carried out within the scope of the project using qualitative methods. The aim of the research was to obtain information that will enable an in-depth analysis of the findings obtained from the quantitative research on the reasons and the effects of NEET youth in Turkey aged15–29. The in-depth interviews were intended to determine how much access young people between the ages of 15–29 have to education and employment opportunities, their desire to participate in education and employment, their experience in education and employment processes, their expectations regarding education and employment, and their opinions and level of happiness at micro and macro levels in general. When determining which people would be interviewed, “critical situation” and “maximum diversity” methods, which constitute purposive sampling methods, were preferred. Using this framework, a total of 152 in-depth interviews were conducted in 26 provinces, representing 26 subregions in the NUTS-II classification. Age, gender, education, marital status, income level, health status, social exclusion, migration, individual factors, and different disadvantages were considered when selecting the 152 NEET youth. While determining the number of people to be interviewed in 26 provinces, the current population data of the 15–29 age group of the provinces were considered, and these data were obtained from the Address Based Population Registration System on the Turkstat website. After the completion of the quantitative and qualitative field studies, an online workshop was held. The data, findings, analyzes, and reports obtained through the research were shared with scientists, bureaucrats, civil society representatives, and researchers who participated in the workshop. This study was drafted while considering the opinions, suggestions, and criticisms of the participants. The workshop strengthened the applicable and sustainable aspects of the proposal, and model designs were developed. This study, which was drafted after a detailed and scientific analysis of the research findings, includes the results of reports and field studies that deal with the causes and effects of the young population between the ages of 15–29 who are NEET status. There are a diversity of reasons and risks that affect NEET; therefore, the status of Turkey’s NEET youth cannot be expressed using a single indicator. NEET status, which is related to several factors, such as gender, age, education level, income level, family structure, nature of interaction with the environment, local conditions, knowledge, experience, and ability to use access channels, cannot be defined solely as the state of being unemployed or out of the workforce. Differentiating between the reasons an individual becomes NEET by identifying individual, environmental, regional, and internal and external conditions, risks, and opportunities reveals that NEET status is diverse.