#4 His excellent man-management skills
Sir Alex put his man-management skills to a brilliant effect, in order to forge a connection with his players. His relations with his players went beyond a football pitch.
During his stint at the club, Sir Alex managed a variety of individuals; a shy creature like Paul Scholes and aggressive personalities like Eric Cantona and Roy Keane.
While Eric Cantona gave headaches to every manager he played for before Sir Alex, the Scottish gaffer struck the right chords when he took control of the Frenchman. He made a legend out of an infamous footballer who was surrounded by controversies often and was on the verge of retirement.
Recently, Wayne Rooney revealed an insight to the Scot's innate man-management skills, which is worth a read.
That's not all. He ingrained values in his players that are still visible today.
Take Cristiano Ronaldo's never-give-up attitude and endless desire to win. Where do you think that comes from? The Portuguese claiming Sir Alex to be his second father is a fine testament to his peerless man-management skills.
Most important of all, he built a friendly atmosphere where everyone at the club ranging from the kit washer to the club captain felt equally important and responsible for the well-being of the club. His psychological understanding of the human mind and emotions is a reason why he was able to mould Manchester United into more than just a football club - into a big family.