 Hello there. I'm Harriet Blymiller and I'm doing some videos to try to help you out with your research for Crimson and Ago. I hope you find what I have to say helpful and if you do, pass it on to your friends and let them know about it too. Right now I want to talk about evaluating the sources that you include in your research. Now this information may not be necessary for experienced researchers or it might. So what I urge you to do is take what you need from it and leave the rest alone. When you're beginning to research you have to evaluate your sources carefully. That goes without saying. But you evaluate them according to four variables and those variables are the nature of the occasion. That is, is it a thesis, a dissertation? Is it an article? Is it a chapter in a book? Is it a monograph? That would sort of be the occasion.