Most companies today are working in a global environment where competition is hard. In order to be able to survive it is essential that the companies utilise their resources as much as possible in order to keep the production cost low. Maintenance plays a crucial role because of its impact on availability, reliability, quality and life cycle cost (LCC). However, being able to use maintenance proactively so as to increase the utilisation of the production process resources requires access to proper tools and methods for deciding on what maintenance to use and to follow up maintenance impact. Consequently, the overall research problem discussed in the thesis is: How to select a maintenance policy and follow up its performance with respect to cost-effectiveness in order to improve company profitability. In order to solve this overall research problem it has been broken down into four research questions R1: How can different approaches intended for maintaining or improving production process performance assist in the identification, analysis, elimination and prevention of recurrence of problems in a production process?, R2: How should maintenance be selected on the basis of cost-effectiveness?, R3: How should the technical and financial performance of maintenance be measured in order to enable cost-effective improvements? and R4: How to access relevant data required for cost-effective decisions in maintenance?. The philosophical basis applied in the work presented in this thesis is systems theory. When looking at maintenance, it is necessary to have a wide perspective and also see the interaction between maintenance and other relevant working areas. The major contributions that have been achieved and reported in the thesis are: 1. A literature review regarding current approach abilities to identify, analyse and prevent the recurrence of problems, 2. The development of a conceptual model for measuring the maintenance impact through a set of key performance indicators indicating where and how much to invest in maintenance., 3. The development of a maintenance support system for measuring the economic/financial impact of maintenance on both operative and strategic levels, 4. The development of a model for selecting and improving maintenance policies based on cost-effectiveness. The model presented is characterised by being flexible, in the meaning that it is possible to make a selection among any types of maintenance policies., 5. The definition and description of a common database containing relevant data for maintenance management and 6. Results from an exploratory study regarding IT maturity within maintenance management in Swedish industry are presented. The main conclusion of the thesis is that the tools and methods described in this thesis can represent important elements in a system to continuously and cost-effectively improve maintenance performance and thereby better utilise the resources in the production process.

Face aux nouveaux cadres législatifs ou environnementaux dans lesquels ils doivent évoluer, les systèmes industriels actuels sont, en plus d'être contraints par des exigences classiques de productivité et de cout, sujets au respect de nouvelles exigences relatives à la sûreté, la sécurité ou au développement durable notamment. Pour répondre à ces exigences et améliorer la maitrise des performances de ses systèmes, EDF souhaite faire évoluer sa démarche d'Optimisation de la Maintenance Basée sur la Fiabilité vers une nouvelle méthode. Cette méthode nécessite en autre la proposition d'une approche outillée permettant de quantifier a priori les programmes de maintenance (CMPQ) sur ses systèmes par rapport aux indicateurs de performance attendus (KPIs). Cet outillage fait l'objet de cette thèse financée dans le cadre du GIS 3SGS - projet DEPRADEM 2. Après avoir généralisé les besoins d'EDF en regard de la CMPQ, nous proposons une identification de la connaissance générique nécessaire pour évaluer les KPI. Afin d'aboutir à un outil permettant l'automatisation de ces études de CMPQ, cette connaissance générique est ensuite modélisée sur la base de deux langages : le langage semi-formel SysML capitalisant, par l'intermédiaire de différents diagrammes, la connaissance statique, interactionnelle et comportementale ; et le langage AltaRicaDF, supportant un modèle dynamique permettant d'évaluer les KPIs par simulation stochastique. La création de ce modèle dynamique à partir des différents diagrammes est basée sur un mapping entre les concepts d'intérêt des deux langages. La démarche dans sa globalité est validée à la CMPQ d'un cas d'étude fourni par EDF : le système ARE / To face with new legislatives and environmental contexts in which they have to operate, it is needed now that the industrials systems have to satisfy to many different requirements and constraints. Thus, these requirements are not only conventional ones such as availability and costs, but also emergent ones such as safety and sustainability. This report implies for the specific French company EDF (energy power supplier) to evolve from its usual approach of reliability centered maintenance (RCM) to a new approach. It is consisting mainly in developing a tool able to support the Complex Maintenance Programs Quantification (CMPQ). This Ph.D. is dealing with this the engineering and deployment of this tool in the frame of the GIS 3SGS - DEPRADEM 2 project. The first step of the work is to generalize EDF needs, then to propose a framework enabling to identify required generic knowledge needed to assess the Key Performances Indicators (KPIs) for supporting quantification. The next step is to model the generic knowledge in two complementary ways: a formalization of the static, interactional and behavioral knowledge based on different SysML diagrams; and a formalization of the dynamic and executable knowledge formalized by AltaRicaDF (ADF) language, allowing to perform stochastic simulation and to assess required KPIs. The path to elaborate dynamic executable vision from SysML diagrams is released by means of rules between each element of interest of both languages. All this approach/tool is applied to a specific EDF case study: the ARE system

Abstracts in English and Xhosa / Given the need for prompt responses to today’s dynamic market, maintenance and maintenance management functions are becoming increasingly fundamental for industrial companies. Reduction of waste and bottlenecks, particularly the reduction of overproduction and work in process, accentuates the impact of malfunctions or failures of equipment on production. As such, it has become ever more urgent for proactive world-class maintenance to turn to computer-based support for efficacious management. To successfully manage activities such as the scheduling of activities, the planning of preventive maintenance actions, the analysis of data (to reduce the occurrence of malfunction and failures), and augment the absolute performance of the maintenance function, industrial companies implement information systems enabled by computerised maintenance management systems (CMMS) to deliver timely and accurate information. However, while various CMMS are available on the market, not all meet the exactitudes of each industrial company. The overall objective of this thesis is threefold: to explore major barriers and obstacles that have a negative impact on implementing CMMS; to identify the most common critical success factors (CSFs) that have a positive impact on implementing CMMS; and to develop an optimised CMMS model suitable to the context of Ethiopian manufacturing industries. To achieve this, an exploratory descriptive research design was employed, utilising both quantitative and qualitative data-gathering techniques, including structured interviews and questionnaires. Both qualitative and quantitative findings Suggest that the most important CSFs for CMMS implementation were work planning and scheduling and work identification and responsibilities, while the Ethiopian manufacturing firms lagged behind in the case of information technology and appraisal. Overall, key isues in maintenance management range from several maintenance techniques, information systems, scheduling, and optimisation models. This thesis is projected to be a useful source of information for both maintenance managers and stakeholders in CMMS decision making. It also creates opportunities for future research in this area of study. / Ngenxa yesidingo seempendulo ezikhawulezileyo kwimarike yanamhlanje eguqukayo, ukulondoloza kunye nololondolozo lwemisebenzi yolowulo ziya zisanda ngokubaluleka kwiinkampani zoshishino. Ukuncitshiswa kwenkcitho kunye nokuxinana kwindawo eziphezulu , ngakumbi ukucuthwa kwemveliso egqithisileyo kunye nokusebenza kwinkqubo, kunyusa ifuthe lokungasebenzi kakuhle okanye ukusilela kwezixhobo kwimveliso. Kananjalo, kuye kwangxamiseka nangakumbi kulondolozo lwenqanaba lehlabathi ukuba liphendukele kwinkxaso esekwe kwikhompyutha ukwenzela ulawulo olusebenzayo. Ukulawula ngempumelelo imisebenzi efana nokucwangciswa kwemisebenzi, ukucwangciswa kwezenzo zolondolozo zokukhuselo, ucalulo lwedatha (ukunciphisa ukwenzeka kokungasebenzi kakuhle kunye nokusilela), kunye nokwandisa ukusebenza ngokupheleleyo komsebenzi wolondolozo, iinkampani zamashishini zisebenzisa iinkqubo zolwazi ezenziwa ziinkqubo zolawulo lokulondoloza ngekhompyutha (i-CMMS) ukuhambisa ulwazi oluchanekileyo kwangexesha. Nangona kunjalo, ngelixa ii-CMMS ezahlukeneyo zifumaneka kwimarike, ayizizo zonke ezihlangabezana ngqo nemilinganiselo yenkampani nganye yemizimveliso. Eyona njongo yale ngcingane ebhaliweyo engqinelwa ziingxoxo, ithisisi ihlulwe kathathu: ukuphonononga imiqobo engundoqo kunye nezithintelo ezinefuthe elibi ekuphumezeni iiCMMS; Ukuchonga ezona zinto zibalulekileyo zempumelelo (CSFs) ezinefuthe elihle ekuphumezeni iCMMS; kunye nokuvelisa imodeli ye-CMMS elungele imeko yemizimveliso yase-Ethiopia. Ukufezekisa oku, uyilo lophando oluchazayo lwasetyenziswa, kusetyenziswa ubuchule bokuqokelela idatha eninzi kunye nesemgangathweni, kubandakanya udliwanondlebe olulungiselelweyo kunye nephepha lemibuzo.Zozibini iziphumo ezedatha esengangathweni kunye nedatha ngokobungakanani zibonisa ukuba ezona CSFs zibalulekileyo ekuphunyezweni kweCMMS yayikukucwangciswa komsebenzi nokucwangciswa nokwenza uludwe lweenkqubo kunye nokuchongwa komsebenzi kunye noxanduva, ngelixa iifemu zemveliso zase-Ethiopia zisasele ngasemva kwimeko yolwazi lwetekhnoloji kunye novavanyo. Kukonke, imiba ephambili kulawulo lolondolozo isukela kwiindlela ezahlukeneyo zobuchule zolondolozo, kwiinkqubo zolwazi, kuludwe lokwenziwa kweenkqubo zolwazi, kunye neemodeli ezigqibeleleyo. Le thisisi kuqikelelwa ukuba ingumthombo wolwazi oluluncedo kubo bobabini abaphathi bezolondolozo kunye nabachaphazelekayo ekuthathweni kwezigqibo kwiCMMS. Ikwadala amathuba ophando lwexesha elizayo kulo mmandla wokufunda. / Business Management / DBL (Business Leadership)