This eBook is the premier volume of our "Mental Illness/Central Nervous System" series, focussing specifically on " NEURODEVELOPMENTAL DISORDERS". This eBook release encompasses diagnoses such as intellectual developmental disorder (IDD, communication disorders, autism spectrum disorder, attention-deficit/hyperactivity disorder, specific learning disorder, developmental coordination disorder and others (specified and unspecified). The content comprises a total of 275 "MCQs with Guiding Answers" and 294 "Linked References". This eBook also contains numerous "Study Highlights or Summary Keypoints" alongside the "CLINICAL PRACTICE INSIGHTS" section. Our primary clients include medical professionals, clinical pharmacists or PharmDs, nurses, and various other individuals in the healthcare sector, such as mentors, residents, and students. We adhere to conventional design principles for all our sequential eBook publications to circumvent the trend of "hypercoloremia mania" in eBook design. This predominantly employs the official black and white colour scheme. This publication resulted from a collaborative effort with my skilled and dedicated coauthors, namely PharmDs Arwa Alashqar, Duaa Alqhaiwi, Najd Alyasjeen, Kariman Hatem, Areej Al-Manasyeh, Marah Hussein, Leen Albishawi, Eman Awwad, Farah Qaryouti, Dana AlTaweel, and Alia' Saidan.