The lexical approach focuses on teaching language as fixed expressions and chunks that occur frequently, rather than as single words. Students are thought to learn grammar patterns and vocabulary more effectively by perceiving language this way. Key aspects of this approach include teaching collocations, idioms, social greetings, and other combinations of words that commonly go together, as well as having students accumulate and store chunks in a lexical notebook. However, the lexical approach lacks a detailed learning theory and full characterization as an approach.