Always assume that you are learning by adding new concepts onto concepts you have recently or not so recently discovered. Think about building a sky scraper and how different terms, concepts and ideas fit together to give rise to your structure and understanding of the bigger picture. Review and testing yourself on the material after reading it are keys to proving to yourself that you have a grasp of the material just covered. Summarize what you have read in your notes in your own words and review these notes regularly.
It is important to understand that you need to vary your style and speed of reading with the material at hand. Most people will "read" a newspaper by scanning a page until they find something that sparks their interest and then they will start to skim that article, not worrying about picking up the minor details unless it is something very important. At that point their reading will slow down dramatically until they understand what is being reported or opined. Likewise, technical material and important complex concepts should send up a yellow flag as you speed along and cause you to slow down to make sure you pick this part up.
Last Updated: 08/20/2013