What is the difference between empathy and sympathy, and how are these constructs

connected to prosocial behavior? How are these constructs traditionally assessed?

What will be an ideal response?

Empathy has more to do with emotion-sharing and emotional understanding; however,
empathy does not always correspond to a prosocial response. For example, a person
that becomes angry over another's distress may focus more on their own emotions than
their friend's. Sympathy represents showing major concern for the welfare of another.
Although some have tried to assess these constructs via self report, the majority of
researchers assess facial expressions, and possibly physiological reactions, as people
observe the plights of others. In general, it is theorized that the relationship between
empathy and prosocial behavior is mediated by sympathy.