-Should document cost calculations so that full benefit of CT project can be quantified.
-Calculate annual operating costs for existing process including waste treatment and estimate how these would be changed with the introduction of CT options.
-Calculate payback period. More detailed analysis include internal rate of return (IRR) and net present value (NPV)
-Consider technical aspects, environmental benefits and savings in process and waste operating costs along with payback period for investment, to decide which options are viable.