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To ensure realistic output, the values of input variables and constants must also be realistic. For this reason the program watches the input items at all times and takes action should the user slip and go out of permissible regions.

 

There are two types of limits: inner (I) and outer (O). For each type there is a lower and an upper limit.

 

If an input value supplied by the user falls outside the outer limits the program rejects the value and reminds the user of the acceptable limits. If the value is inside the inner limits the value is accepted by the program without comment. If the value is between the outer and inner limits the program accepts it, but warns the user that the input value is unusual.