To eliminate this problem we have to keep the watch list to a manageable size. Say, have no more than 20 stocks in one watch list. If we have more than 20 stocks on our list we would create several watch lists. Each watch list would belong to a different category. For example we would put stocks from different sectors to different watch list. Keep all your watch lists at the same place. If you have watch lists at different websites most likely you will forget about some of them.
Put the strongest stocks in your watch lists, stocks of the leading companies in that sector. Companies that have products which gives them advantage over the competition.
Once you have the stocks you are interested in, in your watch lists check them regularly, at least once a week. Many people forget to check their watch lists and when their check it it’s too late.
Keep your watch lists fresh. If you don’t like the stock anymore delete it and add new ones you like better. Your watch lists needs regular maintenance.