مهدی رضایی

Despite being a popular topic in language testing, cognitive load has not received enough attention in vocabulary test items. The purpose of the current study was to scrutinize the cognitive load and vocabulary test items’ differences, examinees’ reaction times, and perceived difficulty. To this end, 150 students were selected using cluster/convenience-sampling, and took the Cambridge Placement Test (CPT) and Vocabulary Size Test (VST; Nation & Beglar, 2007). After uploading the vocabulary-size test’s items in PsychoPy software, there was a behavioral stage to measure students’ reaction times and correct responses. Out of these 150 high school students, a total of 60 (20 from each proficiency level of elementary/intermediate/advanced groups) were selected. In this quantitative study, all 60 students were interviewed to determine their perceived difficulty of the international VST items and their item’s difficulty-index. The data were analyzed quantitatively via simple regression and qualitatively through the examination of the students’ perceived difficulty. The results and interview findings revealed a significant connection between cognitive load/reaction time, difficulty estimate, and perceived difficulty at intermediate level. In contrast, at elementary and advanced levels, these variables could not predict the cognitive load. The findings can help to test, course, and syllabus designers by educating them on the significance of cognitive load theory so that they can base their exam designs on its premises and alleviate students' increased cognitive-workload.

The questions of centralization and decentralization arise in every polity. The constitution or the practice or both have to settle how much of policy making is to be decided by the central government and by component bodies. By and large liberalism and decentralization tend to go together while authoritarianism tends to be associated with centralization. The constitutional model which is generally regarded as bringing about the largest amount or decentralization is federalism. This is said to sonstitute a half way house between confederacies (where component units dominate)and unitary states (where the center dominates) In its classical form at least , federalism stipulates that there have to be two independent levels of government (the centre and upper level component bodies (often named states) each of these levels has the right to decide on matters falling within its own sphere. There are difficulties in practice especially with respect to the constituent power and to the fields allocated to each level. Federalism must be based on a rigid constitution there has to be s supreme court protecting the independence of the two levels of government there has to be a second chamber defending the rights of the component bodies at the central level.yet there are variations in the extent to which the component bodies are protected and generally in the extent to which there is decentralization. On the one hand federal states are becoming more centralized on the other centralization cannot go beyond a given point without leading to gross inefficiency and perhaps to a break up of the regime as the communist experience showed. Partly for this reason there is a degree of convergence between federal and unitary states. Federalism is also associated with efforts to bring together independent states but this has occurred in a smell number of polities only. Attempts at achieving closer cooperation between states has led more commonly to confederacies, such as the Unites Nations. The European community or European :::union::: has innovated by forming a type of association labeled supranational which is intermediate between the confederal and the federal models. There is innovation in that developments take place gradually with new fields beings progressively covered new structures being set up and new member states joining. The problems of centralization and decentralization have exercised the minds of many in relation to many types of organization : both efficency and freedom appear to be at stake . federalism succeeded in a number of contexts but it is not the panacea which some suggest it is it is also so diverse that one has to refer to federalisms rather than to federalism . what is at stake is the need to find an equilibrium between the two extremes of over centralization and break up. Given the large number of situations in the contemporary world one should look for a variety of solutions and for a continuous evolution of the models which have hitherto been proposed.