The Zurich-based company is receiving advice from Credit Suisse Group AG and Dyal Co. on a possible sale or spinoff of the unit, the people said, asking not to be identified because discussions are private. The board of the Swiss engineering company is likely to make a decision by the end of the year on whether to pursue a transaction, they said. Infrastructure funds, private equity firms and some Asian rivals could be interested in the asset, though some could be discouraged by the investment, financing or regulatory requirements, the people said.