Lockheed Corp. agreed to buy Metier Management.

The Burbank-based aerospace firm said it signed a letter of intent to purchase Metier Management Systems, a group of five companies that produce Artemis, a computer-aided project management system. The Metier companies, founded in 1976 and incorporated in five countries, are privately held and their revenues are expected to reach $80 million this year, Lockheed said. The companies will be integrated into Lockheed’s Information Systems Group, which includes four other computer and data-processing operations.