Eliminate scraps of paper. The greatest argument for having a day-planner or a notebook is looking at a desk and wall that are covered with notes on scraps of paper. In most of real life, organization is critical to greater effectiveness, and those who are organized carry themselves more professionally and effective than those who are not.
Most people lose information because it is buried under more information that they have now stuck ‘somewhere’ so they would remember it. Do they? Most times not.