Once you have done the hard work of finding resources for your assignment, the next task will be to evaluate whether those sources are accurate, up-to-date or even suitable to include in your assignment.
Some factors to consider before using the sources for your assignments:
Currency : Is the source is up-to-date or recently updated? example: published date.
Relevance : Does the source meets you information needs as well as the intended audience?
Authority : Who wrote it? Is the source reputable? Are there any evidence presented to support their argument such as references, tables of results, graphs?
Accuracy : Is the source/information accurate, reliable and truthful?
Purpose : Why the source/information was created? Is it biased or presenting personal views?
Getting Critical by 
Academic culture : a student's guide to studying at university by William Angliss Institute Library (LRC), Building C | Ground Floor T | 9606 2237 | E | lrc@angliss.edu.au