This has been a stellar year for Prince William's economic development. That's what Prince William County Executive Bern Ewert will tell the Board of County Supervisors on Tuesday when he presents a status report of the previous four years.

The year, highlighted by some of the largest projects in the county's history, including those of America Online and Covad Communications Inc., was already on its way to being the biggest year for new and expanding businesses even before the most important announcements were made.

The county pulled in four corporate headquarters this year, including Deck America, Aeronautical Systems, Computer Learning Centers and Micro Computer Retail Solutions.

Deck America, a deck manufacturing and building company, moved from Lorton to Woodbridge, bringing with it about 180 employees--a number that since has grown to about 230--and $1.7 million in investment to the county.

Aeronautical Systems brought eight employees and an investment of $250,000.

Computer Learning Centers, which moved from Fairfax, brought 170 employees and $13 million in investment. Micro Computer Retail Solutions brought with it 28 jobs and a $700,000 investment.

The total investment for the year has topped $600 million--largely because of AOL's operations here--well above last year's total of $32 million. America Online made up $520 million of this year's investment figures.

The total number of estimated job additions for this year--which is the number of jobs a company says it expects to eventually have--is about 3,400. That is more than last year's 2,222 job total.

In 1999, according to the Department of Economic Development, 126 new and expanding projects were reported, with 40 in the targeted industries--high tech, biotechnology and corporate headquarters. The number of expected new targeted jobs this year totaled 2,324, which is 43.5 percent higher than the previous three years combined.

Recommendations for the Department of Economic Development's future goals and actions will be made at the board meeting on Tuesday.