Abstract:2.1 The design process in terms of probabilities2.2 Definition of design2.3 Uncertainty2.4 Entropy2.5 Joint entropy, conditioned entropy and relative entropy2.6 Mutual information2.7 Upper and lower bounds of mutual information. Information content of a variable2.8 Process information2.9 Spaces of definition: need–solution–response–satisfaction2.10 Degree of satisfaction2.11 Conceptual and detailed design2.12 Operators. Necessary, generated and available information2.13 First statements