A case study is a research method used in social and life sciences, typically involving an in-depth investigation of a single individual, group, or unit to gain insights into complex phenomena. It can be used to generalize findings across multiple cases, known as multiple-case studies. Case studies are often qualitative but may also include quantitative data. They allow researchers to explore complex topics by narrowing them down into manageable research questions and provide a holistic understanding of nursing care. The process involves defining the case, reviewing existing literature, and collecting data through various methods such as observations, questionnaires, and interviews. Data analysis reveals themes and insights about the cases, helping to understand the overall phenomenon or 'quintain'. Multiple-case studies offer stronger evidence and more comprehensive insights compared to single-case studies. However, case studies have limitations, including the difficulty of managing large volumes of data and the potential for research focus to shift. Reporting findings can also be challenging due to word limits in some publications. Examples include studies on nurses' pain management practices and the quality of care in nurse practitioner-led clinics. These studies highlight how case studies can reveal important insights into complex healthcare issues, such as the impact of nurse practitioner roles and healthcare policies on patient care. Overall, case study methodology provides a framework for evaluating complex issues and enhancing understanding of nursing practice.A case study is a research method used in social and life sciences, typically involving an in-depth investigation of a single individual, group, or unit to gain insights into complex phenomena. It can be used to generalize findings across multiple cases, known as multiple-case studies. Case studies are often qualitative but may also include quantitative data. They allow researchers to explore complex topics by narrowing them down into manageable research questions and provide a holistic understanding of nursing care. The process involves defining the case, reviewing existing literature, and collecting data through various methods such as observations, questionnaires, and interviews. Data analysis reveals themes and insights about the cases, helping to understand the overall phenomenon or 'quintain'. Multiple-case studies offer stronger evidence and more comprehensive insights compared to single-case studies. However, case studies have limitations, including the difficulty of managing large volumes of data and the potential for research focus to shift. Reporting findings can also be challenging due to word limits in some publications. Examples include studies on nurses' pain management practices and the quality of care in nurse practitioner-led clinics. These studies highlight how case studies can reveal important insights into complex healthcare issues, such as the impact of nurse practitioner roles and healthcare policies on patient care. Overall, case study methodology provides a framework for evaluating complex issues and enhancing understanding of nursing practice.