Negligence – The Contracts Law provides that everyone holds an obligation to ensure that their legal activities do not harm other parties interests or legal rights. In concluded contracts, the parties are responsible also for their eventual non-performance of acting as a reasonable person, otherwise their harmful non-activities would lead to compensation or penalty for damages, suffered by the opposite party. Negligence, if it causes injury to the other party, can build legal bases for claiming the other party liability at the civil court under tort. Negligence is always assessed having regards to the circumstances and to the standard of usual management/care which would reasonably be expected of a party in similar circumstances.
See also http://www.lectlaw.com/def2/n010.htm .