A computer-implemented method of providing an evaluation of at least one of a behavioral disorder, developmental disorder, or neurological disorder of a subject, comprising: receiving data of the subject related to said at least one of said behavioral disorder, said developmental disorder, or said neurological disorder, wherein said data of the subject was previously collected and comprises a sample of a diagnostic instrument and demographic data, wherein the diagnostic instrument comprises a set of diagnostic questions and corresponding selectable answers, and wherein said at least one of said behavioral disorder, said developmental disorder, or said neurological disorder comprises one or more of autism, autistic spectrum disorder, attention deficit disorder, attention deficit hyperactive disorder (ADHD), speech or language delay, social or behavioral delay, or intellectual disability; evaluating the data of the subject using an assessment model to generate an output; applying at least two thresholds to partition said output into one of three segments corresponding to a positive determination, a negative determination, and an inconclusive determination with respect to a presence or an absence of said at least one of said behavioral disorder, said developmental disorder, or said neurological disorder; performing additional evaluation, in response to said inconclusive determination, until said positive determination or said negative determination is generated, wherein said additional evaluation comprises repetition of said receiving, evaluating, and applying steps to receive another set of data of the subject and evaluate said another set of data of the subject, and wherein said positive determination or said negative determination comprises an indication of a presence or an absence of said at least one of said developmental disorder, said behavioral disorder, or said neurological disorder; and providing the additional evaluation for the subject, the additional evaluation comprising said positive determination or said negative determination with respect to said presence or said absence of said at least one of said behavioral disorder, said developmental disorder, or said neurological disorder. receiving data of the subject related to said at least one of said behavioral disorder, said developmental disorder, or said neurological disorder, wherein said data of the subject was previously collected and comprises a sample of a diagnostic instrument and demographic data, wherein the diagnostic instrument comprises a set of diagnostic questions and corresponding selectable answers, and wherein said at least one of said behavioral disorder, said developmental disorder, or said neurological disorder comprises one or more of autism, autistic spectrum disorder, attention deficit disorder, attention deficit hyperactive disorder (ADHD), speech or language delay, social or behavioral delay, or intellectual disability; evaluating the data of the subject using an assessment model to generate an output; applying at least two thresholds to partition said output into one of three segments corresponding to a positive determination, a negative determination, and an inconclusive determination with respect to a presence or an absence of said at least one of said behavioral disorder, said developmental disorder, or said neurological disorder; performing additional evaluation, in response to said inconclusive determination, until said positive determination or said negative determination is generated, wherein said additional evaluation comprises repetition of said receiving, evaluating, and applying steps to receive another set of data of the subject and evaluate said another set of data of the subject, and wherein said positive determination or said negative determination comprises an indication of a presence or an absence of said at least one of said developmental disorder, said behavioral disorder, or said neurological disorder; and providing the additional evaluation for the subject, the additional evaluation comprising said positive determination or said negative determination with respect to said presence or said absence of said at least one of said behavioral disorder, said developmental disorder, or said neurological disorder.