I.R.I.S. Readiris Pro 12 for Windows User Guide - Manual (Page 62)

Chapter 9 – Recognizing documents
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 Click Fixed if all characters of the typeface have the same width.
This is often the case in old typewriter documents.
 Click Proportional if the characters of the typeface have a
different width. Virtually all fonts in newspapers, magazines and
books are proportional.
Important: these document characteristics do not apply to Asian,
Hebrew or Arabic documents.
U SING INTERACTIVE LEARNING
Readiris offers an interactive learning function. By means of
Interactive learning you can train the recognition system on fonts
and character shapes, and correct the OCR results if necessary.
During interactive learning, any characters the recognition system
isn't sure of are displayed in a preview window, in combination with
their parent word and the proposed solution.
Interactive learning can substantially enhance the accuracy of the
recognition system and is particularly useful when recognizing
distorted, defaced forms. Interactive learning can also be used to
train Readiris on special symbols it is unable to recognize initially,
such as mathematical and scientific symbols and dingbats.
To enable interactive learning:
 On the Learn menu, click Interactive Learning.
 Define the necessary settings and click the Recognize + Save
button to recognize the document.