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There are tons of different areas or niches for mediation work. There is no one single way to become a generalized mediator. What you learn, where you look, who you network with are all going to be dependent on what type of mediating you decide to do.  For example, if you wanted to go into family mediation (dealing with children, with divorce, domestic violence, and so on) you would need to be certified in behavioral or social sciences as well as in child development. Mediating workplace disputes would require knowledge specific to the workplace and to the laws and practices therein. It's even better if you have experience dealing with matters particular to that specific workplace, or type of workplace (for example, dealing specifically with factory issues, or mining litigation). Other types of mediation niches include: environmental, art, education, malpractice, criminal justice, landlord/tenant, gay/lesbian, and so on. The best way to get a feel for what is required of a mediator is to talk to someone who is or has done it. It's especially good to find someone in your specific area. While talking to someone who mediates art disputes could be informative, it won't have the same information needed if you're looking to go into workplace disputes.  Go to conferences. There are tons of conferences devoted to mediation all around the world. Check and see if there are any in your area (for the U.S., for example, Chicago, New York, and various parts of California hold large mediation conferences yearly).  Get a feel for how the system works. When you do meet with someone who is a mediator, you'll want to find out how the system works so you can be as effective as you possibly can. This includes finding out what the work environment is like, what their advice is for getting established, and who decides which mediators are established. Get a feel for what you need to know. Ask them about the types of laws, and rules you'll need to know, and education background that you'll need to have. Depending on the niche you decided to work in you may not need a master's degree, but it can definitely help your credentials. Proving that you have experience with the topic is important if you want to be successful as a mediator.  Remember that if you wanted to mediate in Family Law, you would need a background (preferably a master's or a PhD) in behavioral or social sciences as well as family and child development. It's also not a bad idea to get a degree in conflict resolution, as universities and colleges are increasingly offering this opportunity, If you decided to be a civil, general equity, or probate mediator you would need to have at least five years of professional experience in your field of expertise as well as an advanced degree and a minimum of two successfully mediated cases within the last year, or an undergraduate degree and a minimum of ten successfully mediated cases within the last five years. Often if you get your PhD in your chosen subject the courts waive your need to have a certain number of successfully mediated case. Either that or the reduce the amount of successfully mediated cases you need to have. Mediation doesn't require any specific qualifications (except in Florida which has qualification requirements). There are certain qualification classes you can take, but usually these only give you the qualification that you completed the course, without guaranteeing that you are actually a certified mediator.  You should go to school in your chosen field (art mediation, or law mediation, environmental mediation) and get a degree that shows you know that area well. Having a law degree can be incredibly useful, because it shows that you know and understand law, especially laws in a particular area. To get listed as a professional you typically have to have several years of experience with mediation (internship, community mediation volunteer, etc.).
Look into the different types of mediation work. Talk to someone who is a mediator. Get a master’s degree in your chosen field. Consider getting certified.