Graphical Analysis of Test Items

Graphical Item Analysis (GIA) visually displays the relationship between the total score on a test and the response proportions of the correct and false alternatives of a multiple-choice item. The GIA method provides essential and easily interpretable information about item characteristics (difficulty, discrimination and guessing rate). Low quality items are easily detected with the GIA method because they show response proportions on the correct alternative which decrease with an increase of the total score, or display response proportions of one or more false alternatives which do not decrease with an increase of the total score. The GIA method has two main applications. Firstly, it can be used by researchers in the process of identifying items that need to be excluded from further analysis. Secondly, it can be used by test constructors in the process of improving the quality of the item bank. GIA enables a better understanding of test theory and test construction, especially for those without a background in psychometrics. In this sense, the GIA method might contribute to reducing the gap between the world of psychometrists and the practical world of constructors of achievement tests.     

Schematising activities in early childhood education

The purpose of this study was to determine the importance of introducing schematising to children in early childhood and to determine whether schematising can be taught to children. This was done using a longitudinal, quantitative study with a quasi-experimental design (N = 133). In this study, the use of schematising was taught to an experimental group of children to determine if it is possible to realise significantly improved results in schematising tasks for an experimental group in comparison to a control group of children who were not taught schematising. Pupils in the experimental group demonstrated significantly better results on schematising, which cannot be explained by maturation. In our future research, we will investigate the mathematical performances of these experimental and control groups in the next grade of the primary school curriculum.     

Learning by starch potato growers: learning in small businesses with no employees

In small businesses with no employees, learning environments have a low learning readiness. Consequently, learners need to rely on their own agency to shape their learning experiences. Results from a study of agricultural entrepreneurs indicated that the components of motivation and self-regulated learning strategies shape learner's agency and explain learning environment configuration in small businesses with no employees. Configuration of the learning environment was found to be a weak determinant of the learning performance of these learners. However, results showed that prior performance of learners in small businesses with no employees dictates how their agency operates and what learning effect is achieved; higher prior performance results in higher learning effects. We conclude that mechanisms that underlie learning in traditional learning environments work similarly in learning environments in small businesses with no employees.     

Book review

Gender & Technology: Empowering Women, Engendering Development** London and New York: Zed Books Ltd. . By Everts, Saskia (1998)

Privatising Agricultural Extension in India** Policy Paper 10, National Centre for Agricultural Economics and Policy Research, P.O. Box 11305, New Delhi 110 012, India, February 2000. 95 p. 64 . By Rasheed Sulaiman V and V.V. Sadamate.     

Agricultural development; Opportunities and threats for farmers and implications for extension organisations

Abstract

In many countries agriculture is in a process of rapid change,

• - it has to meet a growing demand for food in a sustainable way,

• - the international competition is increasing,

• - the increase in labour productivity is decreasing the employment opportunities in agriculture,

• - agricultural research is offering many new opportunities to increase productivity,

• - government price support for agricultural products in industrial countries is decreasing.

These changes have many implications for agricultural extension, such as:

• - the knowledge and capabilities of farmers has become a major factor in their ability to compete in national and international markets,

• - advice is not only needed on the adoption of new technologies, but also on many other decisions farmers have to make, such as the choice of their farming system and the decision whether or not to earn an income from outside agriculture,

• - this requires a change in extension methods and in the information sources extension agents use,

• - agricultural development demands painful changes in the way of farming and of living for many farm families. It is a challenge for extension agencies to help farm families to realise this,

• - a major task for leaders of extension organisations is to manage a process of change in agricultural extension. Often the role extension has to play in agricultural development can not be performed by one extension organisation, but only by a pluralistic extension system.

Agricultural extension is often expected to contribute to a reduction of poverty among farmers and farm labourers. One has to think seriously how one can realise this objective.     

Farmers’ reasons for changing or not changing to more sustainable practices: An exploratory study of arable farming in the Netherlands

Abstract

The paper describes the results of an exploratory study of farmers’ reasons for changing or not changing to more sustainable production methods in arable farming in the Netherlands. The background of the research is the disappointing adoption of Integrated Arable Farming Systems (iafs). Perceived production risk was expected to be an important factor constraining adoption. This study suggests, however, that perceived risk is not a satisfactory explanation. One reason is that iafs as it has become in Dutch practice cannot be easily distinguished from conventional arable farming systems. A continuum of gradual adoption of iafs methods, mainly for economic reasons, was observed. A real watershed difference was observed between partial adopters of iafs and organic farmers who used no chemicals at all. Secondly, dealing with production risks, such as weather‐dependent problems with weeds, pests and diseases, is considered part of professionalism of both conventional and iafs farmers and hence not a reason for avoiding a specific crop husbandry technique. However, uncertainties emanating from market conditions and environmental policy were found to be important considerations. JAgr Educ Ext (2001, 7, 3, pp 153–166)     

Book review

Miteinander Reden: Kommunikationspsychologie für Führungskräfte (Talking with another: Communication psychology for leaders). by F. Schulz von Thun, J. Ruppel and R. Stratmann (2000), Reinbek, RoRoRo Sachbuch 60687, ISBN 3 499 60687 9, DM 16.90.