i)"Porter's five forces framework is a perfect tool for analyzing

the attractiveness of an industry." Do you agree with this statement? Why or why not? 
ii)Use the value chain to discuss how to build differentiation advantage in a company.
iii)"Different organizational structure and culture should be designed to facilitate the implementation of different types of strategy". Do you agree with this statement? Why or why not?
iv)Why is it so important to analyze and understand the external and internal environments for strategic success? 
v)What affects the sustainability of competitive advantages?  
How to obtain "sustainable" competitive advantage? (rate of core competence obsolescence due to environment changes, availability of substitute of core competence, imitability of core competence)