What conditions must the State of Israel guarantee in order to return the residents of the north to their homes?

What should Israel do about the Lebanese problem? Today, while Israel is pondering that forward-looking question, there are some 80,000 evacuees from the State of Israel’s northern communities, who had resided up to 5 km from the Lebanese border. Can they be returned safely to their homes, without any lengthy, large-scale military operation that would exact a great cost on the home front?