The C.R.A.P. test for information!

Ok, this might be a little too confrontational for you to use with students (depending on your teaching style!) but I find it quite effective for myself. :) 
Click here to enlarge. 

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Some others to try ...

The Quality Information Checklist is a great resource to engage students with how to evaluate websites and promote discussion in small groups about why it’s important to do this.

This tutorial from Center Moriches School is good too but the links are not always live, so may need to be adapted to fit your purpose.

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