To help you through the systems and put them into context, we have graded them under the following categories:

Ease of Use              - how easily and quickly can the method be applied?
Effectiveness            - how good is it for retaining information?
Power                    - how much information can be reliably coded?
Learning investment      - i.e. how much effort does it take to learn the 
                           system before it can be used?
Who should use           - some of the more sophisticated systems are only 
                           worth learning if you are really interested in 
                           memory techniques. Others should be useful for 
                           everyone

Please note that this grading is necessarily subjective - as stated earlier, different people have different learning styles, different approaches to subjects, different brains and different life experiences. You may find that what we find to be difficult you find easy, or vice versa. Consider these grades to be general guides.