Larry, trade size as a percentage of the total trading acct is imo a KEY and very difficult money mgmt question...the issue is risk/reward and more basically avoiding wipeout... ...let's forget for the moment all other assets and focus just on the trading acct... imo qqq positions equal to minimum 25%-50% of total acct with perhaps up to two simultaneous positions are needed to achieve satisfactory gains in swing trading... yet some protective mechanism (either stop loss or hedging) is also necessary...