The semiotic distinctions (syntactic, semantic and lexical) have also been used to classify the best known methods of auditory display (earcons, auditory icons and parameter mapping) (Blattner et al. 1994). Earcons are short musical motifs using musical tones (Blattner et al. 1989), auditory icons are modeled on everyday sounds like a tap running or a door slamming (Gaver 1994), and parameter mappings present data variations in auditory variations such as duration, brightness, pitch etc. (Kramer 1994a; Scaletti 1994). Earcons are a syntactic method, auditory icons are semantic, and parameter mapping is lexical. This section describes these methods, along with strengths and weaknesses of each.