The best technique you can use is to listen. For a victim of domestic violence to open up is a great achievement. Be prepared to just hold your opinion of the situation until all the facts are on the table. if you have not gone through the same situation , it will be difficult to relate to the many faces of abuse. Get all the facts, sometimes emotions get in the way of reason and this helps. Educate yourself and do some research of resources. There many organizations that specialize in victims of domestic violence. Have numbers and contacts in case the person accepts your help. Keep it I a small card so she/he can hide it inside the shoe. Open a communication venue but don't pry, unless this person is in immediate danger or there are minors involved.
If a person asks you for help to escape an abusive situation, be sensitive and reassuring her that is the best. If the person has not come to terms with the situation, be prepared to act or send her to someone that is trained in this situations. Sometimes the bigger picture is more complicated than what it seams. I hope that this will send you on your way to help someone. thank you for allowing me in your page.