All of you have probably already heard about Krav Maga. Until recently, this used to be a self-defense system only used by the Israeli Defense Forces. Since it was proven that the system is highly effective and that it can be easily learned by amateurs for self-defense reasons, a lot of gyms have offered such courses.
The main idea behind Krav Maga is that the self-defense ought to be conducted in a short amount of time and with causing minimum damage to the person with which one find himself or herself in combat. If you are curious to learn more, make sure to sign in a Krav Maga Zurich class.