Scaling is inferior behavior b/c when you are right, you will be filled for only a part of your size, while when you are wrong, you will be filled for your full size. It's a mental crutch so that you feel good.
1) short-term pos become long-term, vice versa
2) sell half your size too early, but then chalk it up to "no one ever went broke taking a profit"
3) add to losers, cut winners short
4) scale into longs, get filled for 25% of full size, and then feel good when mkt goes up