Hamidah Ummu Khoir. K1215026. INDONESIAN ERRORS IN SERVICE LETTER AND THEIR RELEVANCE IN LEARNING INDONESIAN LANGUAGE IN FIRST MIDDLE SCHOOL: STUDY AT THE OFFICE OF GROGOL DISTRICT, SUKOHARJO REGENCY. Thesis, Faculty of Teacher Training and Education, Sebelas Maret University Surakarta, July 2022.

This study aims to describe and explain (1) how the form of errors in the use of Indonesian in official letters at the Grogol District office, Sukoharjo Regency, (2) what factors cause errors in the use of Indonesian in official letters at the Grogol District office, Sukoharjo Regency, ( 3) how to overcome errors in the use of Indonesian in official letters at the Grogol District office, Sukoharjo Regency, (4) how is the relevance ofe the result of the analysis of errors in the use of Indonesian in official letters at the Grogol District office, Sukoharjo Regencywith learning to writh letters in junior high school. 

The method used is a qualitative method. Sources of research data include (1) documents (files of official letters at the Grogol District office, Sukoharjo Regency), (2) informants (Grogol District secretaries and Grogol District archiving staff). The sampling technique was purposive sampling. Data collection by document analysis and interviews. The validity test technique uses source triangulation and method triangulation.

The results of the study were found: (1) The forms of errors in the use of Indonesian in official letters at the Grogol Subdistrict office, Sukoharjo Regency, among others, were errors in sentence composition, errors in choosing diction, and errors in the use of Indonesian spelling. Sentence errors consist of: sentences do not meet unity, sentences do not meet coherence, and sentences are not effective. Word choice or diction errors consist of: non-standard words, inefficient words, and errors in the use of suffixes. Errors in the use of Indonesian spelling consist of: Errors in using punctuation marks, Errors in writing abbreviations, Errors in using capital letters, Errors in writing italics, and Errors in writing loan words. (2) Factors that cause errors in the use of Indonesian in official letters at the Grogol District office, Sukoharjo Regency, include: the lack of competence of sub-district employees in mastering Indonesian language rules; lack of training on proper and correct writing of official letters; and the factor of inaccuracy in writing official letters. Efforts to overcome errors in the use of Indonesian in official letters at the Grogol District office, Sukoharjo Regency, are to conduct training for employees of the Grogol District office, Sukoharjo Regency; procurement of manuals in writing official letters; improve the activities of writing good and correct official letters. (3) Efforts to overcome errors in the use of the Indonesian language in official letters at the Grogol District office, Sukoharjo Regency, are by conducting training for employees of the Grogol District office, Sukoharjo Regency; procurement of manuals in writing official letters; improve the activities of writing good and correct official letters. (4) The relevance of the results of the analysis of errors in the use of Indonesian in official letters at the Grogol District office, Sukoharjo Regency with learning to write letters in Junior High Schools is the implementation of the use of punctuation in official letters in learning Indonesian in Junior High Schools contained in the Class VII Learning Implementation Plan (RPP). Chapter 2 Personal and Service Letters in the indicators section.

Keywords: Analysis of language errors, official letters, teaching materials