What is the resource?
Can you identify the type of resource. This question can be asked on different levels
For example, is it a website or a journal article? Is it primary research or secondary research? What type of research is it? (review article. clinical trial, case study etc.)
Who is the author?
Can you identify the person or organisation responsible for writing the work? Are they qualified or expert on the subject? If you don't know who is responsible for the work - can you be sure that it's credible?
Why was is written?
Can you identify the purpose of the work? For example, is it trying to persuade the reader or does it give a unbiased account? Do you have a thorough understanding of the topic if you only study one point of view?
When was it published or last updated?
Is the information still current to the topic you are researching? If the information is not recent, can you rely on it to provide you with up-to-date information? Evidence from the last 5 - 10 years will be the most up-to-date.
Where is the information from?
Does the author make clear where they got the information in their work from? For example, are they presenting original data or have they provided references. If they have not verified their work with sources, can you trust it?
How is it relevant to your assignment?
Does the work address your research topic in-depth? Is it aimed at an appropriate audience e.g. academics? Have you searched across a range of information to determine that this source is the most suitable to select for your work? If you answer no to any of the above, then even if the resource is good quality, it may not be for you.