organizational behavior

1. What are the advantages and disadvantages of having an internal change agent rather than an external change agent? (answer in 5-7 sentences)
2. Of the three major leadership theories the LPC theory, the path-goal theory, and Vrooms decision tree approach which is the most comprehensive?  Which is the narrowest?  Which has the most practical value? (answer in 5-7 sentences)
3. Is most organization change forced on the organization by external factors or fostered from within?  Explain. (answer in 5-7 sentences)