Abstract: A computer implemented method for displaying values for an output variable comprising displaying a first user interface element configured to present values of a first input variable; displaying a second user interface element configured to present values of a second input variable; displaying a third user interface element configured to present values of an output variable, the output variable varying in dependence upon the first and second input variables; receiving first user input of a value for the first variable via the first user interface element; receiving second user input of a value for the second variable via the second user interface element; and updating the third user interface element to indicate at least one value of the output variable in response to the first user input and the second user input.

Abstract: A computer implemented method for displaying values for an output variable. The method comprises: displaying a first user interface element configured to present values of a first input variable; displaying a second user interface element configured to present values of a second input variable; displaying a third user interface element configured to present values of an output variable, said output variable varying in dependence upon said first and second input variables; receiving first user input of a value for said first variable via said first user interface element; receiving second user input of a value for said second variable via said second user interface element; and updating said third user interface element to indicate at least one value of said output variable in response to said first user input and said second user input.