projected area method vs normal force method

huangyhg

projected area method vs normal force method
  i am working on  a project which is in malayasia. they want us to design modules as per ubc 97 for both seismic and wind. i was reading ubc 97 for wind and found there are two method for wind design ie normal force method and projected area method. i will appreciate if somebody can guide me the diference and which one is use when and how is it different from analytical method of asce 7-05
thanks for help
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design loads will be higher if used ubc 1997 to calculate wind loads.