This paper describes the two-step method used to analyse the factors and aspects influencing human error during the maintenance of mining machines. The first step is the cause-effect analysis, supported by brainstorming, where five factors and 21 aspects are identified. During the second step, the group fuzzy analytic hierarchy process is used to rank the identified factors and aspects. A case study is done on mining companies in Serbia. The key aspects are ranked according to an analysis that included experts who assess risks in mining companies (a maintenance engineer, a technologist, an ergonomist, a psychologist, and an organisational scientist). Failure to follow technical maintenance instructions, poor organisation of the training process, inadequate diagnostic equipment, and a lack of understanding of the work process are identified as the most important causes of human error.

Human errors are one of the main sources of many problems related to the reliability of mining machines. Occurrence of human errors is caused by the actions as failure (omission, unsuccessful attempt) to execute a required function, wrong decision in a response on certain problem, performing of function that shouldn't be executed, unsuccessful in recognition (observation, revealing) of a dangerous condition that requires corrective measures, bad timing and bad response on unpredicted circumstances. Integration both of approaches to human factor analysis: top-down (Causes-effect diagram and 5 Why?) and bottom-up (event tree analysis) for mining machines maintenance operations effectiveness improvement is considering in the paper. The method of Causes-effect diagram and 5 Why? are used in the subject investigation to detect and systematize human factors (human errors) that affect the results performing for the mining machines maintenance operation, i.e. sources that cause a maintenance problem. Event Tree Analysis is used as additional method in regard to Causes-effect diagram and 5 Why?. This method described certain logical events which come from primary initial event -- error of maintainer. Event tree is in the subject investigation developed in order to find modes for mitigation waste (injury).

This work gives a model of OH&S risk assessment for the workplace driller in the process of implementation the geological exploratory works. Model of OH&S risk assessment for the workplace driller is based on ISO 31010 Standard and fulfilling the requirements of OHSAS 18001 and legal regulations. In this case, a partially adjusted and optimized Kinny method was used. Model of OH&S risk assessment provides a reasonable basis for development and implementation the system of occupational health and safety management in accordance with BS OHSAS 18001: 2008, since it is practically applied and tested in the organizations dealing with geological exploratory drilling, such as 'Geops Balkan Drilling Services' Ltd., Drillex International Ltd., International Drilling Service Ltd. and Stara Planina Resources Ltd.

This paper points out the opportunities and needs for integration the maintenance function with other management systems in accordance with the requirements of ISO 9001, ISO 14001, OHSAS 18001 as well as the new Standard ISO 55001. It defines the flowchart of risk assessment in the procedure of mining equipment maintenance as well as the methodological framework for risk assessment in the procedure of mining equipment maintenance. The proposed risk assessment model defines the criteria for probability of occurrence the hazardous events as the consequences that may arise, as well as the mechanisms for control the assessed risk. This risk assessment model can be also put in the context of integrated risk management.

This work presents a methodological approach to the identification of aspects and evaluation the environmental impact, in order to optimize the model of risk assessment of environmental pollution for the mining projects, in order to improve and advance this process on the example of the project 'Magnesite Mining in the Deposit Cavlovac - Masnica' in the area of the municipality Cajetina. .

ABSTRACT In this paper, we report on the results of the CHI98workshop on task, process and work analysiscoupled with object modeling. This workshop was afollow-up to a CHI97 workshop of the same topic.This year's workshop took as its starting point thesummary paper and framework created in last year'sworkshop. The goal of this year's workshop was tobridge the conceptual gulf between current HCIpractice and current development practice. Theresult of this workshop is a proposed set ofextensions to UML, a key standard in the object-oriented development community. Keywords Task Analysis, Process Analysis, Object Modeling,Use Case Modeling, User Interface Design, UML INTRODUCTION The CHI97 workshop, "Object-Oriented Models inUser Interface Design," addressed the question ofthe role of object modeling in user interface designwork [10]. The participants spent much of this twoday workshop finding common ground anddeveloping a meta-description of this commonground that characterizes the roles of objectmodeling in the process of user interface design.Though a few key areas of contention wereoutlined, all participants were in strong agreementwith the framework as a description of the commonground. This framework, with the addition of somedetail as a result of cooperative post-workshopeffort, appeared in the SIGCHI Bulletin [11].