(introduction...)

The model requires a range of input parameters, which are entered in the blood collection, blood processing, blood wastage, blood distribution, and extent necessary dialog boxes in the [VALUES] menu. The [VALUES] menu can be used to change the input parameters for the program simulations used in the calculations. The mouse, arrow and return keys can be used to move between different input screens, and to change the model’s inputs.

Where appropriate, limits on the ranges of different parameters have been specified in the model (such as proportions being greater than zero and less than one). Where a number chosen falls outside the permissible range, an error sign is displayed, and the user is given the option to input a different number. The model comes with a default set of pre-assigned inputs. Each time the program is opened, the set of input parameters revert to their default settings. Other sets of inputs can be saved in [FILE], under the header [SAVE].

Each of the dialog boxes are described below. The default values are shown.