Which of the following best defines Global Developmental Delay?

Global Developmental Delay is primarily a diagnosis used for assessing children under the age of five who exhibit significant delays in multiple areas of development, such as cognitive, physical, language, and social skills. The designation of this delay is fundamental, as it reflects an inability to reach developmental milestones within the expected timeframe, providing a necessary framework for identifying children who may require early intervention.

The focus on children under five is critical because developmental assessments and interventions are most effective during these formative years. This diagnosis allows for the recognition of developmental challenges early on, which is essential for timely support and assistance.

In contrast, the other options involve either age groups that do not fall under the diagnostic criteria for Global Developmental Delay or inappropriate conditions for its application. For instance, behavioral issues in older individuals or adults with intellectual difficulties do not align with the definition and purpose of Global Developmental Delay, which is specifically concerned with developmental progress in early childhood. Similarly, relying solely on IQ testing does not capture the broader spectrum of developmental delays, as it overlooks other critical developmental domains.