Growth isn't following the course Wake County, N.C., school leaders were expecting, so they are looking at changes in how they'll deal with crowding in the next five years. District administrators want to convert Leesville Road Middle School in North Raleigh to a year-round calendar in 2009. That change is being considered because enrollment in middle and high schools is expected to grow faster than projected. At the same time, staffers say elementary school enrollment isn't expanding as quickly as projected. This means the opening of some new elementary schools could be delayed to temporarily house middle school students in the buildings.