How to facilitate learning by novices (students) on their road to expertise has attracted the attention of a vast number of researchers in cognitive and educational psychology as well in the field of learning and instruction. Although many studies have investigated the phenomenon of expertise development, the implications of the findings for instruction are scattered throughout the literature. This article reports the results of a systematic literature review of 37 studies on expertise development. Using Tynjälä's Integrative Pedagogy Model as an organising framework, the implications for educational practice described in these studies are presented as 10 instructional principles. This study takes a step towards translating expertise development research into guidelines for instruction. Implications for future research are discussed.

Development of professional expertise is the process of continually transforming the repertoire of knowledge, skills and attitudes necessary to solve domainspecific problems which begins in late secondary education and continues during higher education and throughout professional life. One educational goal is to train students to think more like experts and approach the mastery of a subject as an expert would. Helping students to develop professional expertise and evaluating whether classrooms are conducive to the development of expertise is difficult and time-consuming. At present, there is no instrument that measures all the core classroom factors that influence specifically the development of professional expertise. This paper describes the development and validation of an instrument that measures the extent to which educators create a Supportive Learning Environment for Expertise Development, the SLEED-Q. A sample of 586 secondary school students (14-18 years-old) was used for validation. Both exploratory and confirmatory factor analyses were carried out. Examination of the fit indices indicated that the model seemed to fit the data well, with the goodness-of-fit coefficients being in recommended ranges. The SLEED-Q, consisting of seven factors with 30 items, the SLEED-Q has potential as an instrument for examining how conducive learning environments are to development of professional expertise in secondary school settings. The implications of the results and potential paths for future research are considered.

The ability to solve problems is a key skill and is essential to our day-today lives, at home, at school and at work. The present study explores the quality of managerial problem-solving of participants who are in secondary education. We studied 10th, 11th, and 12th graders following a business track in the Netherlands. Participants were asked to represent, diagnose and solve business cases. The transcripts (handwritten 'case solutions') of all 213 participants were analysed for managerial knowledge and problem-solving accuracy. Futhermore, we controlled the data for individual interest. The results demonstrate students' progress in terms of the quality of solving problem from 10th grade until 12th grade. Several implications for education are discussed.

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