<![CDATA[This study aims to describe and analyse Indonesian language errors in posters, banners, and information boards in public spaces. It employed a descriptive qualitative approach. The data consisted of lingual units (words, phrases, sentences, and discourse) in ten written public media, collected through observation and documentation using non-participant observation and note-taking techniques, and analysed using the distributional method with immediate constituent and substitution techniques, based on an error classification framework, the Indonesian Spelling Guidelines (PUEBI), and the Great Dictionary of the Indonesian Language (KBBI). The results show errors in spelling, diction, punctuation, affixation, sentence structure, and code-mixing; non-standard spelling and diction occurred mainly in informal business media, whereas media issued or installed by official institutions still contained punctuation and diction errors. The novelty of this study lies in its cross-media analysis of public written media issued by businesses, organisations, and official institutions within a single error classification framework, accompanied by correction suggestions for each datum. The findings contribute to mapping language errors in public spaces and imply the need for language editing and for monitoring the use of Indonesian in line with national language policy.]]>
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