1) In "Good to Great," the author also introduces us to the three circles of the Hedgehog concepts? What are the three concepts?

2) In the article "Desperately Seeking Synergy" the author states that executives have a strong bias toward synergy and due to this they sometimes make ill-advised attempts to force units to cooperate. These biases come in 4 forms - "Synergy bias", "parenting bias", "skills bias", and "upside bias". Would you please take a moment and describe one of these biases?