I worked for a company in which all employees were assigned one book a month from the "Successful Employee/Manager" genre. Each book seemed to contradict the one before it, and each book was touted in its month in the limelight as absolute truth by upper management. I began to be amazed at how easily the "truth" can shift and change in as little as 30 days.
Frankly, if I had ever read one that WAS the truth, I wouldn't have recognized that truth after months of bombardment with the "newest truth."
Dilbert reminds me every day that, even though I am hurting financially because I had to take an early retirement (due to a layoff and no jobs in CA for older workers), I am happy because I don't have to deal with crazy bosses.
I used to have a boss who would say she had read or heard thus-and-such about managing or employees or whatever. Dum-dee-dum-dum. No amount of techniques will work if you don't understand the reason for them and and they don't come naturally.