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Calculating the cost of product precisely and presenting reliable information and reports for economic decision making are the objectives of cost accounting systems. But, the independent auditors reports reveal that most of the manufacturing companies, especially state companies, do not possess suitable methods for cost accounting of products. To identify the insuficiencies of cost accounting systems of these companies, two companies, involved in steel industry were selected and operation process as well as working methods of their different part were examined. The results show that the cost accounting system of the selected companies, compared to a suitable accounting system is very in appropriate. The reasons of its inappropriateness are absence of proper procedures for production cercufation, absence of accounts related to production process, absence of correct information a bout the capacity of production lines, inability to recognize costs behavior, not using proper bases for over head allocations, not using budget mechanism related to list of the bills, not colwlating and registering variances and not preparing reliable managerial reports at certain periods of time.

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The main aim of this work was to investigate the role of the three parameters of organizational culture, budgetary participation, management accounting systems in the improvement of managers’ performance, and also to explain their effects on each other. The results showed that there is a relation between budgetary participation, management accounting systems and managers performance. They also confirmed the detrimental effect of organizational culture on this relationship. It was concluded that in high power-distance and collectivist organizations or societies, budgetary participation will not lead to the improvement of managers' performance, even if sufficient management accounting information is at hand. But there is a positive relationship between the managers' performance and management accounting systems in low-power and individualist organizations and societies. .

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During the past two decades business and manufacturing have observed significant and radical changes. Companies have used automation in the manufacturing, in order to improve quality and competency. It was expected that along with these changes, management accounting systems, which focus on monitoring and analyzing management decisions, should adapt with and encourage the changes. Many authors have claimed that management accounting systems have not helped the suitable business and manufacturing strategies in the new environment. Some even claim that it has hindered investing in advanced manufacturing technology and productivity. This research, by analyzing information collected from 101 Iranian business units from various industries and manufacturing settings, investigates justification basis for capital investment in advanced manufacturing technology. The study demonstrates that there is more correlation between qualitative factors such as; manufacturing capabilities, improved product quality and, competition position with investment justification than quantitative bases such as; accounting rate of return (ARR), internal rate of return (IRR) and, net present value (NPV).