So, we must first map the psychological findings to parameters of a natural language generator (NLG).
this presents several challenges: (1) The findings result from studies of genres of language, such as stream-ofconsciousness essays (Pennebaker and King, 1999), and informal conversations (Mehl et al., 2006), and thus may not apply to fixed content domains used in NLG; (2) Most findings are based on self-reports of personality, but we want to affect observer's perceptions; (3) The findings consist of weak but significant correlations, so that individual parameters may not have a strong enough effect to produce recognizable variation within a single utterance; (4) There are many possible mappings of the findings to generation parameters; and (5) It is unclear whether only specific speech-act types manifest personality or whether all utterances do.