Summary The purpose of this article is to compare two different articles, one written by LE Berk in 2010, that explores development across the lifespan. The other article was written by the staff and research team at Lucile Packard Children's Hospital at Stanford in 2012 and addresses what cognitive development is and the progress of cognitive development in adolescence. Cognitive development begins from the moment of birth and continues throughout life. However, this student believes that cognitive abilities are more complex during the adolescent years. Therefore, the issue that this article will address is the cognitive development of adolescence. Instead, both articles agree that as a child moves from childhood to adolescence, his or her cognitive development progresses from thinking and/or reasoning with real objects to more abstract and systematic thinking and/or reasoning. Berk (2010) supports his arguments and information with older cited works such as Piaget's Theory: The Formal Operational Phase (1958) and other more recent studies on how information processing influences cognitive development. However, Lucile Packard Children's Hospital at Stanford does not use the studies cited but, according to the website's disclaimer, the staff and research team provide this information for educational purposes only. While there are similarities to both articles, they address different perspectives of cognitive development in adolescence. For example, Berk (2010) addresses Piaget's theory. Information processing of cognitive development in adolescence. Instead, Lucile Packard Children's Hospital at Stanford addresses different levels of cognitive development in adolescence and ways to encourage healthy cognitive development in adolescence. Discussion... half of the paper... the student left the room to let him think about what he had said. Ten minutes later he brought her a knife and showed her where he had cut his wrist (but not deeply) because he didn't want to hurt himself anymore and leave the one who truly loves him. He made a well thought out and logical decision to live and no longer let this girl control his life. This student believes this is a good example of applying the information learned and steps provided by Lucile Packard Children's Hospital Stanford (2012) to create healthy cognitive development in adolescence. Works CitedBerk, L. E. (2010). Exploring lifespan development (2nd ed.). Boston, MA: Allyn and Bacon. ISBN: 9780205748594Lucile Packard Children's Hospital Stanford (2012), Cognitive Development. Retrieved February 3, 2012, from http://www.lpch.org/DiseaseHealthInfo/HealthLibrary/adolescent/cogdev.html