We’ve found some useful tools to help students embarking on literature searches and reviews. They are free to use for non-commercial purposes.
These tools were developed by the Critical Appraisal Skills Programme (CASP) of the NHS Public Health Resource Unit (PHRU):
The Centre for Evidence-Based Medicine also has some excellent tutorials for critical appraisal
And if you are yet to be convinced why it is important, the CASP Birmingham have a nice page called Why critical appraisal?