The Drainage Services Department signed a $2.36 million consultancy agreement on 26 February 2015 with Advisian Limited for the application of “Reference Class Forecasting” in drainage and sewerage projects.

“Reference Class Forecasting” is a forecasting methodology developed by Professor Bent Flyvbjerg of the University of Oxford, U.K.. It achieves accuracy in projections by basing them on the actual performance of a reference class of similar past projects.

The consultancy comprises a feasibility study of the aforementioned application and the development of reference classes for project forecasting purposes. The agreement will last for about 18 months.