Many concerns have been raised about the validity of the existing instruments measuring teachers' efficacy. Recently, a new instrument to measure teachers' perceived efficacy has been presented, namely, the Teachers' Sense of Efficacy Scale (TSES). The purpose of the present study is to examine the psychometric properties of the TSES in the Greek educational context. A total of 405 Greek secondary school teachers voluntarily participated in the study. A within-construct and between-construct approach was used to examine the validity and reliability of the Greek version of the TSES (factorial validity, internal consistency, temporal stability, and correlation with external criteria). Results are encouraging and seem to support the suitability of the TSES to assess teachers' efficacy within the Greek educational context.

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The purpose of this study was to examine the effect of a structured, playful activity program on the development of social skills in kindergarten children during break time in the schoolyard. Twenty eight boys and thirty two girls aged from 5 to 6 years old consisted the sample of the present study. The participants were randomly divided into two groups the treatment and the control group respectively. The experimental group participated in a 4 weeks playful program while control group didn't participate in any kind of structured activity. Data were gathered through observations and videotaped recordings of the students in the schoolyard during breaks. The researcher coded children's behaviours from video recordings and completed the Social Skills Rating System (SSRS) for each child, before and after interventional program. Results demonstrated that there was statistically significant difference between the degree of development in students' social skills during breaks and their participation in a structured programme of playful activities in the schoolyard.

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