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Varför går det sönder?: Metodutveckling för rotorsaksanalys vid fältkvalitetsärenden på Scania CV AB
2011 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Scania’s engine development handles quality defects, encountered by customers, in field quality arrends, called FQ cases. Complex FQ cases are handled by a department called NMKB, consisting of about ten assignment leaders who manage cross functional groups to solve FQ cases. One part in FQ cases is to conduct root cause analysis where problems are analyzed and root causes are established. The approach has earlier been unstructured and subjective with a big influence from personal opinions, which has led to false conclusions from the root cause analysis and that false solutions have been implemented in FQ cases. This has resulted in longer lead times for FQ cases and the root cause analysis has needed to be improved There has therefore been a need to develop the root cause analysis with a standardized method, in aim to make a more comprehensive analysis which increases the certainty of having found root causes to problems and thereby reducing average lead time and also reducing variations of lead time for FQ cases. The master’s thesis has been conducted as a case study at Scania CV AB in Södertälje. It has been carried out by a literature study and situation analysis, followed by an initial development of a method for root cause analysis. To ensure usability and efficiency of the method, an iterative implementation of the method has then been conducted. The method has then been tested on three FQ cases and after each test evaluated and improved. The result is a method where participants of an FQ case get together in an initial meeting where information about the FQ case is presented and the problem in the case is clearly defined, commonly. Thereafter, root cause analysis is conducted with help from a tree diagram, systematically established and demanding evidence for each mapped cause. In suspicion of complex relations between causes a relation diagram can be used as a complement. The tree diagram results in a an activity list where each activity is assigned to a responsible person to simultaneously get a base for managing the case. After the meeting, defined problem, tree diagram, potentially relation diagram and activity list are documented in an Excel document, according to established template. The Excel document then can be used as report data for the FQ case.

Place, publisher, year, edition, pages
2011. , 61 p.
Keyword [en]
Technology, kvalitet, rotorsaksanalys, root cause analysis, Pproblemlösning
Keyword [sv]
Teknik, kvalitet, rotorsaksanalys, root cause analysis, problemlösning
URN: urn:nbn:se:ltu:diva-52073Local ID: 938bc79b-6767-429c-90f5-5ee62260b8d8OAI: diva2:1025439
Subject / course
Student thesis, at least 30 credits
Educational program
Industrial and Management Engineering, master's level
Validerat; 20110616 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Persson, NilsTapani, Per

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