 Skimming is for superficially processing large quantities of text at a low level of comprehension (below 50%).Advice for choosing the appropriate reading-rate includes reading flexibly, slowing when concepts are closely presented and when the material is new, and increasing when the material is familiar and of thin concept.Speed reading courses and books often encourage the reader to continually accelerate; comprehension tests lead the reader to believe his or her comprehension is continually improving; yet, competence-in-reading requires knowing that skimming is dangerous, as a default habit.