i am no senior to answer your question but owing to the fact that you come from the same ALMA MATER as mine so here it is
it is an in-direct system of democracy having itself associated with democratic system of US.it was used in the era of Ayub Khan who used this system to strengthen and legitimize his presidency "democratically"

for more.....
http://www.mongabay.com/history/paki...mocracies.html

in case of any query....feel free to ask

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Tainu Kafar Kafar aanday,,,,tou aho aho aakh (Bullhay Shah)