Respond to the following:I really appreciate the discontinuous development concepts and feel that it rings more true to me.  While humans progressively develop throughout their infancy and childhood into adulthood, its difficult to believe that it is a more or less continuous process and straight line.  A great example to me is learning to swim as a child.  I would swim every summer and advance my skills a bit.  However, when the weather turned colder this would end for several months.  During this time, I would work on other skills like ice skating and once summer returned ice skating would end.  I think its safe to say that people progress in their learning with the ebb and flow of the exposure.  We are not constantly learning every new skill at the same time and progressing all of our skills at the same level.  It is much more a phased process.