While tests of basic motor abilities such as speed, maximum strength or endurance are well recognized, testing of complex motor functions such as agility remains unresolved in current literature. Therefore, the aim of this review was to evaluate which main factor or factor structures quantitatively determine agility. In methodological detail, this review focused on research that explained or described the relationships between latent variables in a factorial model of agility using approaches such as principal component analysis, factor analysis and structural equation modeling. Four research studies met the defined inclusion criteria. No quantitative empirical research was found that tried to verify the quality of the whole suggested model of the main factors determining agility through the use of a structural equation modeling (SEM) approach or a confirmatory factor analysis. From the whole structure of agility, only change of direction speed (CODS) and some of its subtests were appropriately analyzed. The combination of common CODS tests is reliable and useful to estimate performance in sub-elite athletes; however, for elite athletes, CODS tests must be specific to the needs of a particular sport discipline. Sprinting and jumping tests are stronger factors for CODS than explosive strength and maximum strength tests. The authors suggest the need to verify the agility factorial model by a second generation data analysis technique such as SEM.

Public support of library services must be targeted towards children because these services play a key role in their development. However, no prior research has investigated the value of public library services for children. Specifically, earlier studies evaluated the value of public libraries as a whole, without considering library services for different stakeholders. The fact that children are not autonomous economic agents is another problem to address. These barriers can be overcome by using the contingent valuation method with parents/caregivers as the subjects queried and children used as the objects in this study. Thus, the economic value of library services for children can be obtained to support managerial decisions on services specifically designed for children. More precisely, this study is unique in that it develops a contingent valuation methodology for estimating the value of children's library services based on adults' willingness to allocate a proportion of municipal budgets. Both users and non-users were surveyed to verify the proposed methodology empirically. The results show that the perceived effectiveness (ratio between perceived benefits and costs) of children's library services is 11.2 (11.2 units of benefits for each unit invested) in Czech public libraries compared with 4.3 for a library as a whole. This finding confirms the essential role of children's library services, implying that public libraries should offer a broader selection of children's books and other services. The study also shows that the value of children's library services depends on the age, education and economic structure of the adults queried. In addition, their satisfaction with library services is another important determinant, indicating that public libraries can influence the perceived benefits of children's library services.

In recent years, the value of public library services has tended to be evaluated using the contingent valuation method. This is able to reveal readers’ hidden preferences. However, it appears that the total value of a public library as expressed by one number leads to a methodological bias related to the difficulty of assessing the value of one standard book loan. Moreover, this approach does not reflect the needs of public libraries’ management. Therefore, this study focuses on a detailed investigation of the most important public library service, book loans. For this purpose, we have employed statistical models to identify the significant determinants of willingness to pay (WTP) for book loans and WTP for purchasing books, respectively. The results suggest that loan services have the greatest perceived value for students, people who are economically active. Management who are interested in increasing the success of their institution across society must also know the perceived value of individual books so that they can adjust their library's acquisition policy. It was found that novels had the highest perceived value, followed by educational literature in the fields of economics and education as well as information science. This entirely new analytical method of measuring WTP for public services raises many new implications that could change the strategies of individual libraries – as well as the public policy strategies of donors and library ownership.