 Based on more than forty interviews with Jobs conducted over two years—in addition to interviews with more than one hundred family members, friends, adversaries, competitors, and colleagues—Isaacson was given "unprecedented" access to Jobs's life.Jobs is said to have encouraged the people interviewed to speak honestly.Although Jobs cooperated with the book, he asked for no control over its content other than the book's cover, and waived the right to read it before it was published.