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...Advances in social science education and humanities research volume th international conference on language literature culture icollite a preliminary study developing contrastive error analyses based german grammar textbook mantasiah r yusri hasmawati muhammad anwar foreign department universitas negeri makassar indonesia corresponding author unm ac id abstract this aims to describe the results of validation developed using both however did not test s effectiveness improving students understanding learning provide an overview elements that should be improved maintained inputs evaluation from validators used quantitative method material experts as users were employed instrument assessed quality presentation layout use showed overall assessment indicators fell into feasible category one strengths is presented develop allow materials well effectively adapted needs keywords analysis linguistics introduction kaweera watcharapunyawong usaha solano et al has been investigated by linguistic ap...