How was Eleven Tactic born?

While watching a UEFA match, I noticed that an assistant coach had a notebook with several pages, each containing the team's tactics drawn. At one point, a substitution was made, and this person went out to show the game tactic to the player entering the field. Suddenly, a gust of wind blew, causing almost all the pages of that notebook to fly away.

I thought, why isn't there a digital system where you can store game tactics on a mobile device or tablet, without the need to print pages and carry notebooks? This is how Eleven Tactic was born.