No Money Management?

I received feedback from a reader looking to sell his trend following system. He described it:

“[My system] is a trend following system. It promises a systematic methodology for assessing trend or relative strength of an individual trading vehicle. As with all band or channel systems, when the prices do not show trend, they will remain within the band. When prices break though the band, it can be taken as a signal to either buy or sell.”

Perhaps there is more, but where is the bet size discussion? Isn’t that the most critical aspect? Where is the money management?