Here are some key differences:

• Observations and behavioural assessment: In-person assessments allow the psychologist to directly observe the individual's behaviour, attention span, and other relevant aspects in a controlled environment. This includes observing the person's ability to sustain attention, impulsivity, and hyperactivity. These direct observations can provide valuable insights into the person's functioning and contribute to a comprehensive assessment. In a phone assessment, the psychologist may rely solely on self-report or the information provided by the individual, limiting the ability to observe and assess behaviours directly.

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• Standardised rating scales and tests: Comprehensive ADHD assessments often involve using standardised rating scales completed by multiple informants, such as the individual, parents, teachers, or significant others. These scales provide valuable information about the individual's symptoms, functioning, and impairment across various settings. In-person assessments typically include the administration and interpretation of standardised tests specifically designed to assess ADHD symptoms and related cognitive functions. These tests contribute to a more accurate diagnosis and understanding of the individual's ADHD profile. In a one-hour phone assessment, the use of these standardised measures may be limited or not feasible.

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• Detailed history and collateral information: In-person assessments generally involve a detailed clinical interview, where the psychologist collects information about the individual's developmental history, academic performance, family dynamics, and other relevant factors. Collateral information from parents, teachers, or other significant individuals in the person's life is also collected. This comprehensive information helps understand the individual's symptoms, impairment, and the context in which they occur. A one-hour phone assessment may not allow for an in-depth exploration of the individual's history and may rely more on self-report, potentially missing important contextual information.

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• Clinical observation and rapport-building: In-person assessments allow the psychologist to build rapport and establish a therapeutic alliance with the individual. This relationship facilitates trust, openness, and accurate self-reporting. In a one-hour phone assessment, establishing a strong rapport can be more challenging, potentially affecting the individual's comfort level and the quality of information shared.

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While a one-hour phone assessment may be useful for initial screening or brief consultations, a comprehensive ADHD assessment typically requires a more extensive evaluation process that includes in-person interactions, direct observations, standardized measures, and the gathering of detailed history and collateral information. It's important to consult with a qualified professional to determine the most appropriate assessment approach based on the individual's specific needs and circumstances.