Organising items into groups makes them more memorable.
Your memory is a little bit like a filing system: the better organised it is, the easier it is to retrieve information.
One of the most versatile and powerful memory techniques is grouping or ‘chunking’ information down into smaller pieces. This technique is particularly valuable when you have a list of letters or numbers to remember.
The average person can only hold between seven and nine ‘bits’ of information in their consciousness at once (this is known as your digit span). But what if those bits were the file names for stores of lots of other bits of information? If you do that, then you’ve effectively got around the seven-to-nine rule, and managed to cram many more bits ...