Step 1: Understanding the Question:
The question asks for the most appropriate psychological investigation method to diagnose and understand why an individual child is struggling academically.
Step 2: Detailed Explanation:
• The clinical method, also known as the case study method, is designed to conduct an in-depth, detailed examination of a single individual.
• This method involves gathering extensive biographical history, interviewing family members, administering diagnostic tests, and examining environmental influences.
• Experimental methods are used to establish general cause-and-effect laws across large groups under highly controlled laboratory conditions, making them unsuitable for individual diagnoses.
• Systematic observation involves recording behavior in natural settings without intervention, which would not provide the deep historical and diagnostic insights needed for Alice.
• The control method is an experimental design technique to rule out confounding variables, not an independent diagnostic tool.
• Therefore, analyzing a specific child's academic deficit through personalized diagnostics and history-taking aligns with the clinical method.
Step 3: Final Answer:
The psychologist would use the Clinical Method to perform a thorough individual diagnostic assessment.