What is negligence in law?

The four elements, in order

1. Duty. Did the defendant owe you care at all? Drivers owe it to everyone on the road; property owners owe it to lawful visitors; doctors owe it to patients.
2. Breach. Did their conduct fall below that standard? The yardstick is the «reasonable person», not the defendant's own best intentions. For professionals the yardstick rises to what a competent professional in that field would have done.
3. Causation. Two questions in one: would the harm have happened anyway (cause in fact), and was this harm a foreseeable result of the conduct (proximate cause)?
4. Damages. Something measurable must have been lost — treatment, income, property, or the documented pain of recovery.

Where cases are actually won and lost

Duty is rarely contested. The fight is usually over breach and causation, and it is a fight about evidence: dash-cam footage, maintenance logs, a 911 recording, phone records showing a driver was texting, the inspection report on a stairwell. Evidence decays fast — video is overwritten in days, a damaged vehicle is scrapped, a wet floor is mopped — which is why the first weeks matter more than the first hearing.

Negligence per se

When a defendant broke a safety statute — ran a red light, served alcohol to a minor, ignored a building code — many states treat the breach element as already proved. You still have to show the statute was meant to protect people like you from harm like yours.

Shared blame

Being partly at fault does not automatically end a claim. Under pure comparative fault you recover your share even at 90 per cent blame; under modified comparative fault you recover only below the 50 or 51 per cent line; under contributory negligence, still the rule in a few states, any blame at all can bar recovery.