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Social semiotics can include the study of how people design and interpret meanings, the study of texts, and the study of how semiotic systems are shaped by social interests and ideologies, and how they are adapted as society changes (Hodge and Kress, 1988). Structuralist semiotics in the tradition of Ferdinand de Saussure focused primarily on theorising semiotic systems or structures (termed "langue" by de Saussure, which change diachronically, i.e. over longer periods of time). In contrast, social semiotics tries to account for the variability of semiotic practices termed "parole" by Saussure. This altered focus shows how individual creativity, changing historical circumstances, and new social identities and projects can all change patterns of usage and design (Hodge and Kress, 1988). From a social semiotic perspective, rather than being fixed into unchanging "codes", signs are considered to be resources which people use and adapt (or "design") to make meaning. In these respects, social semiotics was influenced by, and shares many of the preoccupations of pragmatics (Charles W. Morris) and sociolinguistics and has much in common with cultural studies and critical discourse analysis.