I’m studying for my Business class and need an explanation.

Q1. What are the four stages of the IT Portfolio Management Maturity Model as suggested by Jeffery and Leliveld? Briefly describe the steps organizations follow to establish or upgrade their IT Portfolio Management. (minimum 1.5 page)

Q2. What are the four modes of the IT Strategic Impact Grid as established by Nolan and McFarlan? Please explain their characteristics in brief. (minimum 1.5 page)

Q3. Please give a detailed explanation of the three principles to successfully implement IT as suggested by Feld and Stoddard. (Min 1 pg)