An old man used to live with his three sons. After old man passed away, his lawyer came up to his three sons and gave them his will. Among all other assets, old man had mentioned about 17 ducks in his will. In will old man stated that, "Eldest son should get half  of 17 ducks. middle son should be given one third  of 17 ducks and youngest son should be given one ninth  of 17 ducks."Son's were able to divide up all the assets but they were not able to divide ducks between them. As it was not possible to divide 17 ducks, the way it was mentioned in will. Ever after trying many ways they were not able to solve this problem. So they decided to go to a wise man, who used to live outside village. All three brothers went to him with ducks kept in carriage and told him about their father's will. Wise man listened to them carefully and patiently. After this wise man bought a duck of his own and kept it with other 17 ducks. With wise man's duck, total number of ducks were now 18. Now wise man asked them to open up their father's will and then start to divide ducks accordingly. He gave: half  of 18 ducks that is 9 ducks to eldest son. One third  of 18 ducks that is 6 ducks to middle son. At last  one ninth  of 18 ducks that is 2 ducks were given to youngest son. Now this adds up - with this one duck was left, which wise man's duck. He took it back. The attitude of negotiation  problem solving is to find the 18th duck I. E. The common ground. Once a person is able to find the common ground, the issue can be solved. It is difficult at times. 
To reach a solution, the first step is to believe that there is a solution. If we think that there is no solution, we won't be able to reach any. 