Attention: Attention is the behavioral and cognitive process of selectively concentrating on a discrete aspect of information, whether considered subjective or objective, while ignoring other perceivable information. It is a state of arousal.

Attention deficit hyperactivity disorder: Attention deficit hyperactivity disorder is a neurodevelopmental disorder characterized by inattention, or excessive activity and impulsivity, which are otherwise not appropriate for a person's age. Some individuals with ADHD also display difficulty regulating emotions or problems with executive function.

Attention deficit hyperactivity disorder predominantly inattentive: Attention deficit hyperactivity disorder predominantly inattentive , is one of the three presentations of attention deficit hyperactivity disorder (ADHD). In 1987–1994, there were no subtypes and thus it was not distinguished from hyperactive ADHD in the Diagnostic and Statistical Manual (DSM-III-R).

Attention economy: Attention economics is an approach to the management of information that treats human attention as a scarce commodity, and applies economic theory to solve various information management problems. Put simply by Matthew Crawford, "Attention is a resource—a person has only so much of it."In this perspective Thomas H. Davenport and J. C. Beck define the concept of attention as: Attention is focused mental engagement on a particular item of information.

Attention deficit hyperactivity disorder management: Attention deficit hyperactivity disorder management options are evidence-based practices with established treatment efficacy for ADHD. The American Academy of Pediatrics recommends different treatment paradigms depending on the age of the person being treated. For those aged 4–5, the Academy recommends evidence-based parent- and/or teacher-administered behavior therapy, with the addition of methylphenidate only if there is continuing moderate-to-severe functional disturbances.