The nation's cities are doing more to make themselves good places to raise children. However, a report card issued by zero population growth says there's more to be done. The Kid Friendly Cities study focuses on quality-of-life indicators including, the unemployment rate, the enviroment, education public safety - and a category called community life - a catch-all for intangbles such as the number of books checked out at the library. ZPG is a national organization promoting voluntary limits on population growth. It surveyed 239 cities, including the 25 largest, in three categories: major cities, component cities or suburbs and independent cities. Portland, Oregon; Burlington, Vermont; and Overland Park, Kansas, led their categories respectively. Atlanta; San Bernardino, California; and Moreno Valley, California, placed at the bottom of their categories.