Credentials - Investigate the credentials of whoever created the information with questions like:
Claims - What claims are they making? Is the information they're providing accurate? Can we verify its accuracy?
Objectives - What did they hope to accomplish by creating the information?
Worldview - This element is connected to objectives in that it deals with bias and examining potential bias behind a publication. Every source will have some degree of bias and that's expected, the questions you're asking here are: How does this source frame the situation? What language are they using that helps me understand their perspective or worldview?