      Sometimes it is not possible to determine every aspect of the "how"variable before the trade. Using share size as an indication of how sureyou are about the trade is an excellent money management tool. Sometimesyou will find an opportunity that looks good enough to trade, but not goodenough to tie up all of your capital on. In this case (in the absence of abetter opportunity), make the trade, but cut the initial share size down.All great traders vary the trading size. In the Day Trading industry, it isthe norm to trade in 1,000-share lots. This phenomenon probably hassomething to do with the fact that if Day Traders trade 1,000-shares, it iseasier for them calculate the P&L in their heads. If this is the onlyreason you trade in 1,000-share lots, bad idea!