It is usually fairly easy for classroom teachers to distinguish the students who are on-task from those who are not. Those on-task students tend to be those who are using their time productively towards completing assigned work. These students tend to listen closely to teacher instructions so they may be able to accurately complete the assignment. Generally, on-task students work quietly and purposely during the allotted independent seat work time. However, there are usually a small number of students in the same classroom who tend to be off-task a majority of the time. These students may be quietly avoiding work completion, or they may be actively pursuing other interests in a manner that is disruptive and noticeable. Regardless of the nature of off-task behavior, these students are showing some amount of inattention and under performance in the classroom. Although a few of these off-task students may have a genuine impairment observed as ADHD, many other students may struggle with inattention due to other reasons. These latter students show ADHD-like symptom as a result of alternative conditions which can effectively interfere with classroom learning.

The most common disruptor to learning in the classroom is low motivation, weak work-study skills, poor organization, and inefficiency of time usage. These students tend to be average to low academic performers who will consistently have difficulty producing a volume of high quality work. Fortunately, their work efforts will improve with additional monitoring and reinforcement offered by the classroom teacher.

Aside from these less efficient and under motivated students, there are usually a smaller number of students who are purposely avoiding work completion. The inattention and off-task behavior of these students easily mimics the core symptoms of ADHD. These students are often targeted for ADHD evaluations due their under performance in the classroom. There are number of alternative conditions that can demonstrate with ADHD like symptoms. These include mental health disruptions resulting from divorce, child abuse, death and loss, family moves, parent unavailability due to occupational travel, sudden traumatic experience, or even dysfunctional parenting. Although these disruptors generally tend to be temporary in a child