In recent years, it has to spend lots of time and effort to get the certification of CMMI. Therefore, everyone is looking to tools or methods for speeding up the CMMI certification. CMMI level five, causal analysis and resolution, is an important issues for all industries. In the process of software development, we have to identify the causes for defects at first. Then, it uses a systematic approach to sum up the necessary causes for software defects in order to help managers make better decisions and develop action items. With no doubt, it is a very important issue in the process of software development. This study aims to explore the subject of using the methods of causal analysis and resolution to solve the problems of software defects. Through the implementation of CAR, we can determine the root causes of defects and avoid importing defects to products. This study focus on the implementations of CAR and it proposes the methods, procedures and management forms. Moreover, this study will introduce the Mill¡¦s methods for causal reasoning used in the structure of CAR. Therefore it can help managers with a better way to sum up the causes for defects. The study uses case study method. Firstly, it connects the company for data collection of cause and effect diagram and combines the Mill¡¦s methods to inductive causal and analysis. Then it arranges interviews with the company managers to identify the necessary causes of defects. Finally, it helps the company develop action items in order to achieve the causal analysis and resolutions in the process of software development.

This diploma thesis focuses on problematic about optimizing of service center and provides a base for creation of program for simulation and optimization. This diploma thesis also deals with hierarchical breakdown and logical structures of processes. Also there are quality determining methods and methods for visualization of processes.

The management of quality more often penetrate into the sector of trade and becomes the important part of it. In the first part of my work I introduce the service department of Motorola Company . Also there are the most widely used statistic implements of the management of quality, which can be used for the improvement of the processes in the company. The base of the work is the analysis of brakedowns and their causes accured on reading units, repaired in the company. The result of the work is the corrective solution, which caused the rise of internal quality of the product, which was selected as the most problematic product on the basis of statistic control. The proposing solutions should rise internal quality by falling PPM under 20000. The most of proposing solutions were successfully implemented into the use.

The thesis deals with a proposal to change the production process by eliminating the redundant control activities. The first part of the thesis presents various possible theoretical approaches for this issue. It is followed by familiarisation with the concerned production company. The second part is the analytical part where the carried out activities of a particular automotive production unit are identified. These control activities are investigated and then either omitted or authorized. Finally the root causes for the fact that those activities have not already been eliminated are found.

Background: The company has had a low outgoing delivery precision for a prolonged period. This creates problems as orders must be prioritized in order to be produced on time and partial deliveries are used to satisfy customers. The origin of the problem is unknown to the company, but there are suspicions that the problems arise in production. Purpose: The purpose of the study is to contribute to an improved outgoing delivery precision for Företag X. A current state analysis from the inbound to the outbound flow is conducted to find causes of delays. The study creates a prioritization basis for the company to identify the most critical article groups. This creates a tool for decision support, linked to delivery precision, for manufacturing companies. Methods: This study is a case study at Företag X. The study uses secondary data in the form of quantitative data from the company's business system, but primary data in the form of interviews and the author’s own observations. The data is used to create a cause and effect diagram and to perform an ABC/XYZ-analysis on the company's inventory that forms the basis for segmentation of the articles. Conclusions: The study's conclusion is that Företag X's low outbound delivery precision is due to several reasons such as communication gaps, insufficient production planning and measurement & variation in load. The most important cause is production planning. In order to improve this, other causes must also be solved first and Företag X must follow the priority order that the study has developed. Through this, Företag X can get a better outbound delivery precision and a more efficient flow. Keywords: Delivery precision, production planning, ABC/XYZ-analysis, classification, cause and effect diagram

The aim of this master´s thesis is to design an action to improve of selected process Design and development through DMAIC application. The thesis is focused on identifying the problem, finding the cause and following design of improves leading to eliminate problems. This improves will enable the company to achieve time savings during the process and reduce a risk of orders. Result of this is effective operation in the process.

På grund av en ständigt föränderlig miljö där kundernas behov, krav och förväntningar varierar allt mer kan företag påfrestas gällande att bemöta dessa. Ett resultat av denna trend kan återspeglas i nya tekniska lösningar samt effektiviseringar i både produkter och tjänster. Detta medför en ökad konkurrens och därför blir kvalitetsutveckling en viktig del av effektiviseringsarbetet. Det finns ett stort fokus på kvalitetssäkring i syfte att öka konkurrensfördelar och stärka företags varumärke. Det finns dock ett stort utrymme för effektiviseringar av kvalitetsarbetet i tillverkande företag. Företag kan exempelvis utnyttja olika förbättringsverktyg och hjälpmedel i förbättringsarbetet exempelvis Sex Sigma, Lean, Orsaks-verkan-diagram samt feleffektsanalys.     Syftet med studien är att undersöka och kartlägga kvalitetssäkringsarbetet gällande utgående gods i ett tillverkande företag för att sedan presentera förbättringsförslag.     Det har genomförts en fallstudie på hissföretaget Cibes Lift Group AB. Den valda forskningsmetoden för studien är en kvalitativ fallstudie grundad på primär- och sekundärdata. Jag valde detta främst på grund av att det fanns ett behov av att samla så mycket information som möjligt för att öka min förståelse samt studiens trovärdighet.    Studiens resultat visualiserar att Cibes Lift Group AB arbetar förebyggande med kvalitetssäkring då checklistor används vilka innehåller ett antal krav som bör vara uppfyllda innan godset skickas ut till kunderna. Däremot finns det flertalet förbättringsverktyg och hjälpmedel som företaget inte tillämpar, exempelvis Sex Sigma, Orsaks-verkan-diagram, feleffektsanalys och så vidare. Således finns det mycket förbättringspotential i företagets kvalitetssäkringsarbete men även i det övriga kvalitetsarbetet. / Due to an ever-changing environment where customers' needs, requirements and expectations vary more and more, companies can be pressured to meet these. A result of this trend can be reflected in new technical solutions as well as efficiencies in both products and services. This entails increased competition and therefore quality development becomes an important part of the efficiency work. There is a strong focus on quality assurance in order to increase competitive advantages and strengthen companies' brands. However, there is a great deal of room for streamlining the quality work in manufacturing companies. Companies can use various improvement tools in the improvement work, for example Six Sigma, Lean, Cause-and-effect-diagrams and Failure mode and effect analysis. The purpose of the study is to investigate and map the quality assurance work regarding outgoing goods in a manufacturing company and then present improvement proposals. A case study has been carried out at the elevator company Cibes Lift Group AB. The chosen research method for the study is a qualitative case study based on primary and secondary data.  The results of the study visualize that Cibes Lift Group AB works preventively with quality assurance when checklists are used which contain a number of requirements that should be met before the goods are sent out to the customers. However, there are many improvement tools that the company does not apply, such as Six Sigma, Cause-and-effect-diagrams, Failure mode and effect analysis and so on. Thus, there is a lot of potential for improvement in the company's quality assurance work but also in the other quality work.

The aim of the diploma´s thesis is analysis of the scrap of the chosen process, using the tools of statistical process control and proposal of appropriate containment to reduce the scrap. The thesis describes all seven basic tools of quality and the greatest attention is aimed to Shewart's control charts. One chapter discusses three methods of problem solving in technical practice, while one of the described methods is used in the practical part of the thesis.