Critically assess the Ricardo and Heckscher -ohlin models

Titles: Critically assess the Ricardo and Heckscher -ohlin models. Briefly discuss;
The key empirical results obtained under the assumptions of these models and their policy implications.
Limited 2000 words that include: Introduction, contents with equations and graphics- brief explanation; and conclusion.
Materal to be used: Feenstra, Robert (2004) Advanced International University Press. Chapter 1,2,3,4 and 5 . Thank you