When I first started teaching apologetics/worldview to high school students in 1998, I was given a big book.  You know the ones that you could use as a door stop!  There was so much information that allot of it went over my students head.  So the following year I began to narrow down the questions and information, making it easy for my students to understand and remember!  Attending Christian school as a child and teenager, I was given a great foundation in Biblical knowledge, yet my weakness was explaining why I believed the way I did and facts to support it.  I wanted to create a tool/system that would stick with my students once they graduated.  I call them The Four Basic Questions.