Kjessler & Mannerstrale AB is one of Sweden's largest technical consulting groups. The company works in four business areas: environmental engineering, civil engineering, electrical engineering and building engineering. The company develops, markets and provides advanced services for planning, design, production, operation and maintenance of infrastructure, as well as construction and industrial projects. The company operates in Sweden and Norway and focuses on clients in business, industry and the public sector. Outside Sweden, the company works with selective project assignments, frequently financed by development banks and aid organizations. The company acquired Vab, Wozniak arkitekter and Integria certifiering in 1999. Building and civil engineering accounted for 52% of 1999 revenues; electrical engineering, 19%; environmental engineering, 14% and other, 15%.