high urgency, low volumes, need to keep secret, large bid/ask spread
VWAP lookout for low urgency.
IS lookout for high urgency.
Crossing Network: lookout for large trade vs small volume or secrecy needed.
All trades prefer low spreads.
TWAP - For a thinly traded sec. Which needs comparison with the bençhmark that is illiquid as well. The same % vol of sec. Traded. The respective time are compared