There were a lot of technical observations reviews fit in the ergonomics research labor posture. Technology that's been studied and improved because of different reasons and are usually applied on a variety of conditions. There are many techniques of observation was introduced. For example as RULA, REBA, LUBA, OCRA, OWAS (according to David 2005, Takala et al 2010) and many other methods such as 3D & 2D QUEC, MAC, SPSS, PEO, PLIBEL, JSI, .... In that, through understanding the scientific articles, the research shows that in the current techniques, the OWAS method 3, RULA, REBA has been and is still being used in a way the most widely popular and in many different areas from manufacturing to the service industry, mining. In particular, in the article the safe international career and Ergonomics "technical observers compare 3 reviews the burden of industrial posture" of 2 author Dohuyng Kee and Waldemar Karwowski, 2007 there have been a series of comparisons and conclusions about 3 methods. However, the study results showed that the evaluation pose in the higher risk rate is considered the more sensitive but this is not entirely accurate because of lack of data, measurement of biomechanical research and publication. Therefore, a large proportion of jobs with high posture, the burden is not a sign that that method is better than the rest. That means will still not be able to know which method would better reflect the fundamental risks with different jobs. Also, according to the research paper "comparison of observational technical reviews of the burden and REBA OWAS posture in the logging and wood processing" of author Nopparat Manavakun 2004 gave the opinion that no method would be ideal for any event, because it depends on the needs of the reviews and audience , observing that reviewers would like to make. Also, in the article "recommended maximum retention period to avoid causing discomfort for static standing posture" of the Group author Douwes M MC, Miedema, Dul J 1997 pointed out that on the basis of the maximum retention period for 19 positions, classification 3 group pose over time grasp (comfort , moderate and not comfortable) more relevant to the classification based on biomechanical data and measure human recognition, but their classification for study of 10 in 19 different posture with the classification by OWAS. This demonstrates the ability to assess labor posture over time of the OWAS does not guarantee reliability. Each method has strengths and weaknesses. However, is not yet possible to draw conclusions about the specific method is guaranteed for or how the option of scientific method. The assessment is based mainly on the observation techniques. The observation requirements according to REBA will cover for and if we observe in this direction, we would have had the full information relative to reviews under the 2 remaining methods. So in evaluating labor posture has been made, the author has used a method to assess labor posture or if used from 2 or more methods to compare define the sensitivity of the results of reviews. Therefore, the application of the method of subjective evaluation with each method, there is no uniformity in the use of evaluation results. If possible, we should use simultaneously the OWAS method, RULA, REBA to build a facility more objectively from the results obtained from each method.In the process of conducting reviews, the collection of data from the posture in fact encountered many difficulties because of the possibility of encountering the angle of sight in observation and spend quite a lot of time in each small data record of a labour under the traditional way. Instead, it later researchers have moved gradually to the ergonomic simulation by virtual humans build. As the research paper "ergonomic simulation study on virtual human" of group author Hou Honglun, Shouqian Sun, Pan Yunhe 2007 mentioned the study of an ergonomic simulation system based on analysis and reviews a number of ergonomic factors. In it, the main labour is a factor in about ergonomic. As such, the application of simulation software in reviews labor posture will be a practical application of research to be done.Therefore, the simulation software application and use the results from all three OWAS method, RULA, REBA (except labor posture evaluation direction according to the time of the OWAS) to build a grassroots labor posture evaluation in an industrial brick craft is suitable for evaluating the labour position is objectively easier.
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