The case-history method is an effective approach to studying problem behaviors of a child. This method involves collecting detailed information about the child's background, experiences, and behaviors from various sources such as parents, teachers, and relevant professionals. By gathering this comprehensive information, researchers and practitioners can gain a deeper understanding of the child's problem behaviors and develop appropriate interventions to address them.

The case-history method is particularly useful for studying the following problem behaviors of a child:

1. Classroom behavioral problems:
- By examining the child's case history, researchers can identify patterns of disruptive or challenging behaviors in the classroom setting.
- They can gather information about the frequency, intensity, and triggers of these behaviors.
- They can also explore the child's social interactions with peers and teachers, as well as their academic performance.
- This information can help in devising strategies to manage and reduce these behavioral problems, such as implementing behavior management techniques or providing additional support to the child.

2. Learning problems:
- The case-history method allows researchers to investigate the child's educational background and experiences.
- They can gather information about the child's cognitive abilities, learning style, and any specific learning difficulties they may have.
- They can also explore the child's academic progress, including any areas of strengths or weaknesses.
- This information can help in developing individualized educational plans and interventions to address the child's learning difficulties and promote their academic success.

3. Family problems:
- The case-history method enables researchers to examine the child's family background, dynamics, and relationships.
- They can gather information about the child's living situation, parental involvement, family stressors, and support systems.
- They can also explore any family-related factors that may contribute to the child's problem behaviors, such as parenting styles or family conflicts.
- This information can help in providing family-centered interventions and support services that address the underlying family issues and promote the child's well-being.

In summary, the case-history method is a valuable tool for studying various problem behaviors of a child, including classroom behavioral problems, learning problems, and family problems. By collecting detailed information about the child's background and experiences, this method allows for a comprehensive understanding of the factors contributing to these behaviors and facilitates the development of targeted interventions and support.