# Analysis of Available Solutions for the Improvement of Body Posture in Chairs
## 3 Analysis  
The methodology used in this paper consists of reviewing the scientific literature and researching the commercial market for solutions to detect the upper-body posture. After researching commercially available solutions and solutions proposed in the scientific literature, the next step of this study is the determination of the most significant criteria affecting the decision-making process and determining the grade of importance, or weight, of each individual criterion. The process of determining the hierarchy of criteria is conducted through AHP analysis. AHP stands for Analytic Hierarchy Process, an analytic method involved in complex decision-making processes to objectively determine the importance of each criterion involved in the process of decision making. The reason for this comparison is to determine the order of importance of the criteria and the individual weight of each criterion. These results are used in a PUGH matrix to determine which of the solutions is a better fit based on the requirements. The criteria taken into consideration in this study were chosen based on the characteristics of the interaction between the subject and the detection system, the grade of manufacturability of the detection system into an office chair, the effects regarding the privacy of the user, and the grade of further scalability of the resulting smart furniture piece in the case of series production. The evaluation process for establishing the AHP analysis requires the side-by-side comparison of all criteria used. The analytic comparison process was established by the climatotherapist involved in this study and a group of research engineers with expertise in mechatronics and industrial product design with previous experience in the development and use of posture-detection devices. Thus, the chosen criteria are:  
* Non-invasive: posture detection and correction without physically affecting or hindering the user;
* Accuracy: the effectiveness of the device in classifying/ detecting body postures;
* Portability: whether the device can easily be moved;* Reliability: whether the device can perform accordingly in a repeatable manner;
* Manufacturability: the ability to be efficiently manufactured;
* Privacy: the ability to not spread user-sensitive data;
* Scalability: the ability to extend the process of detection to a wider range of physiogonies without modifying the parameters of the detection and correction system. Based on the results from Table 1, we can reach the conclusion that reliability, having the highest score, is the most important criterion. Furthermore, given the values of the principal eigen value of 7.317 and the result of the consistency ratio of 0.039, it is concluded that the AHP analysis is successful and conclusive. This means that reliability will have the highest influence on the further analysis, more specifically on the PUGH matrix. The second highest score is for accuracy, followed by manufacturability. By computing the weight of each criterion of interest, the technical solutions for determining the posture based on the mass center and upper-body tilt can be analyzed by using a PUGH matrix analysis. The PUGH matrix is a decision-making tool that considers the weight of each individual criterion, and, by assigning a discrete value for each analyzed solution, the final score of the optimal solution is achieved by the highest weighted average of each solution with respect to each criterion and its weight. Due to the wide range of discrete solutions available on the market, in the literature or at request, developed specifically for the user, we decided to group the solutions based on types of detection and analyze the groups through the PUGH matrix based on the average values for the previously mentioned criteria. The means of posture detection analyzed are:  
* S1--Posture correction based on ergonomics, consisting of furniture pieces, such as chairs, that through their design or construction emphasize the importance of ergonomics.