Graphs are mathematical entities whose theory facilitates the discussion of the relationships between the elements of a set. Introduced about 1870 by the pioneers of combinatorics who were then still known as geometers, graphs have recently been recognized as the most adaptable tools for certain organizational problems. After first being used in operations research, graphs have now been introduced into information theory where they have proved to ba of use in many different areas.
Questionnaires are defined to be valuated graphs intended to elaborate choice or decision models and to process certain information. The discussion of problems in questionnaires is based on certain types of graph to be more specially treated in the first volume and involves the language of probability theory. So once the general definitions and the principal construction techniques have been developed, a chapter is devoted exclusively to information theory for discrete sources.
Good text books on graphs are available to French readers at various levels, but there are scarcely any devoted to information theory. So it has been thought necessary to introduce it in axiomatic form in a setting providing easy study.

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