The article describes the development of fundamentals of machine elements and assemblies design processes automation using artificial intelligence, and descriptions of structural elements' features in a natural language. Realization of those processes is in conditions of uncertainty and with non-repeatable processes. The aim of the research is to develop the basis for new design processes of higher level of automation, and object approach to problems and application of voice communication between the design engineer and data processing systems. In the proposed interactive automated design systems, computational artificial intelligence methods allow communication by speech and handwriting, resulting in analyses of design engineer's messages, analyses of constructions, encoding and assessments of constructions, CAD system controlling and visualizations. The system is equipped with several adaptive intelligent layers for human biometric identification, recognition of speech and handwriting, recognition of words, analyses and recognition of messages, enabling interpretation of messages, and assessments of human reactions.