Trigger: (1) Knows or has reason to know danger may cause serious harm/death (2) Trespass foreseable (3) Know or have reason to know child can't appreciate
Duty: (1) Care relative to inability (2) Owner must [a] use reasonable care to [b] protect from danger [c] if cost of the harm outweighs cost of protecting (3) Dangerous intrumentality- higher duty to unappreciable
- -Can balance if too great a burden
- -Old enough to roam appreciates common hazards