 He worked on a team that created both the time-decay queuing model and the fixed-space displacement model to describe how items in short term memory might be lost before they could be encoded in long-term memory.This spawned into research into how organizational devices could expand the capacity of short term memory past the traditional 7 items.A particular mnemonic device that Bower researched that is still popular today is chunking, in which a person groups objects together to improve memory.