Watch the links below
http://www.youtube.com/watch?v=Zq7g1nc2MJ8
http://www.youtube.com/watch?v=EOJbmMB8uCQ
http://www.youtube.com/watch?v=-SQirLL_pqU
Use the links below for more examples.
http://www.youtube.com/watch?v=_oS_LjKse38
http://www.youtube.com/watch?v=_wsp2maK0w0
http://www.youtube.com/watch?v=IRWuAoqeeGM
HW: Complete WS Optimization Section 3.7 and complete 1 - 4 on WS Optimization Homework.