درخت حوزه‌های تخصصی

Abstract The present study is a qualitative research with a phenomenological approach that has been conducted to identify the dimensions and components of professional development of primary school principals and to develop its framework. The statistical population of the study was the principals of public primary schools in Tehran in the academic year of 2019-2020. In two stages of sampling, samples were selected by quota and then purposive sampling methods. Semi-structured interviews were used to collect data. The interview continued until the data exploration and data collection process reached a theoretical saturation point after interviewing 14 people. Data were analyzed by open and axial coding steps. Two methods of verifying the interviewees and verifying an external expert were used to control the validity. Two methods of verifying the interviewees and verifying an external expert were used to control the validity. To determine the reliability, two methods of reviewing the writings and also the method of recoding were used. The agreement was calculated in the coding homogeneity and the agreement coefficient was 86%. Findings showed that the professional development framework for primary school principals has 3 dimensions, 14 components with 117 indicators  Which includes : the content dimension of professional development (with components of general management knowledge, specialized management knowledge, interactive skills, resource management skills, professional skills, personal inclinations, managerial attitude, physical and mental ability and intellectual ability), the dimension of professional development process (with the components of self-development actions and developer relations) and the dimension of organizational requirements (with the components of knowledge acquisition and acquisition of skills, modification of selection and appointment methods of managers, improvement of organizational structure and processes).

Mental fatigue is a factor that may influence performance of chess players. However, effects of mental fatigue on performance of chess players are rarely investigated. Therefore, the aim of this study was to explore the effects of exposure to a mental fatigue protocol on memory function (pattern recall performance) of expert chess players. Thirty expert chess players (55-65 years-old) were randomly assigned into mental fatigue and control groups. Participants in the mental fatigue group were asked to (re-)place observed ordinary and random chess positions on a blank chessboard before and after exposing to a 30-minutes’ mental fatigue protocol. The control group followed the same procedure but they read a text about history of chess instead of exposing to mental fatigue protocol. Two ordinary and two random chess positions were used to measure pattern recall performances in pre- and post-tests. Visual Analogue Scale was used to measure the subjective rating of mental fatigue and motivation for upcoming pattern recall task. Results showed that exposing to mental fatigue protocol increased the subjective rating of mental fatigue significantly in the mental fatigue group. Moreover, motivation was not different between the groups before performing pattern recall task in posttest. Also, results revealed that exposing to mental fatigue protocol impaired pattern recall performance of expert chess players. Finally, expert chess players performed significantly better in recalling ordinary positions than random positions. Findings of the study can add to the existing knowledge on effects of mental fatigue on a variety of sporting context and also provide support for Chunking Theory of Memory and Template Theory.