The law was proposed by the Portuguese Communist Party and it decriminalized abortion during the first ten weeks of pregnancy and was considered by the left as the only way to put an end to the estimated 20 to 50 thousand illegal abortions in the country.

[1] The referendum was held on a summer day, which is said to have contributed to the fact that the turnout was so low that it did not pass the threshold of 50 percent of the voters needed to make the decision binding, although the winning answer, NO, was respected and the law was not changed, meaning abortion was only allowed in exceptional case (such as rape, mal-formations of the fetus and danger to the women's health).

A revote occurred in the 2007 Portuguese abortion referendum, where the result was reversed.

The question present in the ballots was: "Do you agree with the decriminalization of the voluntary interruption of the pregnancy, if it takes place in the first 10 weeks and in an authorized healthcare institution?"

The major parties in Portugal at the time listed with their political positioning and their official answer to the referendum question: All polls published showed an advantage for the YES side, but official results showed a 51 to 49 percent win for the NO side.