A software method for controlling the optimization of a planning model that uses historical sales data to predicts optimal prices and similar factors for meeting a number of business goals. Exemplary membranes according to the present disclosure provide excellent thermal stability and retention characteristics. When coupled in the first position, the second aperture is of a first area and when coupled in the second position, the second aperture is of a second area different than the first area. The humid cellulose material being homogenised is transported through a first shearing zone in the absence of N-methylmorpholine-N-oxide.