The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

The State Council of China issued a guideline to further accelerate household registration reform. A “points system” - mainly based on legal permanent employment and accommodation, seniority in social security and continuous residence - is to be established in cities with over 5m residents. Those who have accumulated certain points are qualified to apply for the cities’ permanent household residence for themselves, their spouses, minor children and parents.
A （） of household registration reform is underway.