Multiple regression with spss

Hi All,

I have done multiple regression in SPSS with three different methods, namely, FORWARD, BACKWARD and STEPWISE. Final outcome is significantly different in BACKWARD as compared to the rest.

Please suggest,

1. why one variable which is selected in FORWARD is excluded in BACKWARD method?
2. How to judge that one outcome is best, i.e. out of the two results (BACKWARD and FORWARD) which one is better the other one?

**Result for STEPWISE and FORWARD is same