The Court abandoned both the trimester system and the strict scrutiny standard of review.
States could not ban abortion before viability.
Court abandoned strict scrutiny in relation to restrictions on abortions and adopted a new test: the "undue burden" standard.
A state regulation was legal as long as it did not have the purpose or effect of placing a substantial obstacle (undue burden) in the path of a woman seeking an abortion before viability.
Here, this standard allowed most of Pennsylvania's abortion restrictions to be upheld.