Multidimensional data analysis with LID data Interrogation language. Chapter I describes the three stages which lead to the analysis of a questionnaire by the language LID: correspondence analysis, data structuring, data exploration with LID. Chapter II describes the language LID and the interface program INTERF between EyeLID-I and ADDAD. Chapter III presents two concrete examples of application: the first is the reanalysis of a British survey; the second is the analysis of a French survey. Chapter IV, in the framework of a ternary frequency table, presents a study of data interaction.