identifying the appropriate number of employees that can be managed by any one supervisor///which method (inductive or deductive) is the best way to deliver bad-news

Span of Control is one of the models examined and it refers to identifying the appropriate number of employees that can be managed by any one supervisor .  Give your opinion regarding what is the appropriate span of control and explain your rationale. 

Armed with this knowledge, make a recommendation for which method (inductive or deductive) is the best way to deliver bad-news.  Defend your answer.