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The following information is from the DSM-IV criteria for confirming ADHD diagnoses:
(APA,2000)

Hyperactive, impulsive or inattentive symptoms that cause impairment must be present before 7 years of age. There must be clear evidence of significant impairment in social, academic, or occupational functioning. The impairment must be present in two or more settings (e.g. at school and at home). Also, the symptoms do no occur exclusively during the course of a Pervasive Developmental Disorder, Schizophrenia, or other Psychotic Disorder. The symptoms cannot be better accounted for by another mental disorder (e.g. Mood Disorder or Anxiety Disorder). Lastly, six or more of the following symptoms of inattention must be present for at least 6 months to a point that is disruptive and inappropriate for developmental level:


1) Inattention
  1. Often fails to give close attention to details or makes careless mistakes in schoolwork, work, or other activities.
  2. Often has trouble sustaining attention on tasks or play activities.
  3. Often does not seem to listen when spoken to directly.
  4. Often does not follow instructions and fails to finish schoolwork, chores, or duties in the workplace.
  5. Often has difficulty organizing tasks and activities.
  6. Often avoids, dislikes, or doesn't want to do things that require sustained mental effort (such as schoolwork or homework).
  7. Often loses things necessary for tasks and activities (e.g. toys, school assignments, pencils, books, or tools).
  8. Often is easily distracted by extraneous stimuli.
  9. Often is forgetful in daily activities.

2) Hyperactivity-Impulsivity
Hyperactivity:
  1. Often fidgets with hands or feet or squirms in seat.
  2. Often leaves seat when remaining in seat is expected.
  3. Often runs about or climbs when and where it is not appropriate (adolescents or adults may feel very restless).
  4. Often has trouble playing or engaging in leisure activities quietly.
  5. Often is "on the go" or acts as if "driven by a motor".
  6. Often talks excessively.
Impulsivity
  1. Often blurts out answers before questions have been completed.
  2. Often has trouble waiting one's turn.
  3. Often interrupts or intrudes on others (e.g., butts into conversations or games).