Reasons for failure of democracy in Pakistan?

Reason: Lack of Patient nurturing of political systems and institutions.

Brief History of Democracy in Pakistan:

1. 1947 - Independence (immediately indulged in war with India)

2. 1956 - 1st Constitution framed (took 9 long years)

3. 1956 - 1st era of democracy

4. 1958 - DEMOCRACY SUSPENDED - 1st military coup - Ayub Khan

5. 1962 - 2nd Constitution framed

6. 1972 - 2nd era of democracy

7. 1973 - 3rd Constitution framed

8. 1977 - DEMOCRACY SUSPENDED - 2nd military coup - Zial ul Haq

9. 1988 - 3rd era of democracy

10. 1999 - DEMOCRACY SUSPENDED - 3rd military coup - Pervez Musharraf

11. 2008 - 4th era of democracy - present -

12. 2010 - wikileaks suggest the current government is under military influence

As I said, it takes time for ANY government to "evolve" to an effective one - this law holds for any nation.

One thing common to ALL successful nations is that they would have had a stable government for an extended period of time - whatever the system might be.