Pronunciation is one of the determiner aspects in English as it can change the meaning of the words and sentences. This research discusses the analysis of errors in the pronunciation of triphthongs in words and sentences in English. The research was aimed to know the types of triphthongs often mispronounced in the pronunciation of words and sentences in English among second semester students in class A of Speaking for workplace communication lecture at English study program of Madiun State Polytechnic. The quantitative were used after being collected from the assignments and pronunciation tests for several words and sentences containing triphthongs during the research. The research results are described in percentages. The diphthong errors that students often make are //a?? /= 34.6%, /a?? /= 31.8%, /??? /= 20%, /???/= 9%, and /e??/= 4.6%. Errors that occurred in the classification of substitutions = 43.64%, insertions = 32.73%, and omissions = 23.63%. The errors occur due to the influence of inter-language and intra-language factors of the students.

This research was aimed to develop CCU materials for students of English Department. This materials was hoped could support students needs and it cound be link and match with workforce and industry. So that the students can get the benefits maximally especially in understanding intercultural communication and communication skills in Cross Cultural Understanding course. This research applied research and development as explained by Thiagarajan (1974). He defined that Research and Development was a research method  which use 4D models those are Define, Design, Develop and Disseminate. The research showed that in the define stage it was counducted need analysis towards 29 students by sharing questionnaires to know the indicator of learning objectives based on learning outcome. In the design stage,  the CCU materials contains 10 chapters, 170 pages. The next stage was development, it was aimed to produce a textbook which was based on students need and by using problem solving skills. There were two steps namely expert validation or judgement and product testing. After conducting the limited test and implementation of the product, then we come to the last stages that is disseminates. In this stage, researcher disseminate the product to the users of the textbook. Before that there were some steps which had been done, first contacting the publisher of the book to get ISBN. Then the second one was after getting ISBN the textbook was ready to be copied and shares to the users.