A majority of corps commanders and principal staff officers were kept in the dark and even then Director General of Military Operations Lt Gen Tauqir Zia learnt about the operation after it had begun, said Aziz, who was the head of the analysis wing of the ISI in 1999.
Musharraf worked on a policy of "need to know" throughout his tenure as army chief and later President, Aziz said.
Musharraf would issue orders to only those who were required to implement them instead of first consulting corps commanders and other officers.
"The Pakistan army did not plan the operation because Gen Musharraf never saw Kargil as a major operation. Only the FCNA was involved in it and perhaps a section of 10 Corps," said Aziz.