The Intelligence and Development Scales-2 (IDS-2) represent a valuable tool for assessing intellectual functioning in children and adolescents. In this presentation, we will argue that the typical use of its intelligence battery can be enriched by introducing two new indices. First, because short-term memory is split into separate domains, and together with memory and speed constitute four of the seven areas used to compute the global IQ score, the current structure risks overemphasizing neuropsychological efficiency while underrepresenting central reasoning abilities, which are more directly relevant to the g factor. Second, unlike Wechsler scales, the IDS-2 does not provide an equivalent of the General Ability Index (GAI), an alternative proxy of g particularly valuable in neurodevelopmental conditions, where working memory and processing speed are not only weaker but also less strongly related to general ability, as shown by recent literature. To address these issues, we propose the development of two new indices for the IDS-2. The first is a Central Ability Index (CAI), designed to capture core abstract reasoning abilities (both verbal and nonverbal) while excluding memory and processing speed. This index would provide a more central estimate of g and help avoid underestimation of intellectual potential in children with uneven cognitive profiles, such as those with specific learning disorders or ADHD. The second is a Balanced Intelligence Quotient (BIQ), designed to provide a theoretically more balanced representation of intellectual ability in line with hierarchical models of intelligence. To this end, we examine the incremental value of supplementing the global IQ score with two additional reasoning subtests, thereby reducing the disproportionate influence of memory and processing speed. Together, these new indices could enhance the IDS-2's clinical utility and theoretical validity, offering complementary perspectives on the assessment of intellectual ability.