Understanding Experimental and Quasi Experimental designs in Psychology Research

I am looking for a very basic understanding of the various types of experimental designs.  According to my text I have come up with 8 different designs.  

1.  I would like a brief description of each of the 8 designs in 50 to 80 words,

a.       Between-subjects design

b.      Within-subjects design

c.       Small n designs

d.      The AB Design

e.      The ABA or Reversal Design

f.        Alternating Treatments Design

g.       Multiple Baseline design

h.      Changing Criterion Design

2.      Discriminate between experimental and quasi experimental