On construction of exact experimental designs from discrete ones

In the paper we try to evaluate approximately optimum exact designs of required goodness from a known approximately optimum discrete design. In dependence on this discrete design we define some subsets of the set of all considered exact designs.

Then we look for sufficiency conditions, on which elements of these subsets are approximately optimum (exact) designs of the required goodness. Moreover we offer a method to find such elements, if they exist at all. Finally we prove some statements concerning the existence of such elements for two classes of (optimum) criteria.     

Challenges for the school in a migration society – a critical incidents analysis

The large number of newly arrived people from other countries, particularly children and youth, represents a major challenge for schools and school systems in the EU-28. The present study, conducted in Germany, investigated this situation using the critical incident technique. Critical incidents were collected in group discussions with teachers and principals about challenging events in the context of growing migration. The incidents, including their perceived causes and consequences, were categorised using qualitative content analysis. Events that were frequently present in teachers’ everyday work included various types of conflicts concerning pupils, difficult cooperation between teachers and parents and parents banning their children from taking part in particular school activities. The identified causes for such events were diverse, including misunderstandings, diverging cultural and religious concepts, language barriers, structural constraints and some pupils’ traumatic experiences influencing the school community. The described incidents had far-reaching consequences, especially for parent–school cooperation and for pupils’ integration in the classroom community and academic and personal development. The final part of this article discusses and illustrates how the results can contribute to developing ideas and measures to deal with the identified challenges.     

Do You Do as I Do?: Young Toddlers Prefer and Copy Toy Choices of Similarly Acting Others

Recognizing similarity between one's own and others' actions is important for identifying others with whom to affiliate and from whom to learn. In this study, 40 19‐month‐old toddlers recognized when a puppet chose the same toys as them. Toddlers preferred to affiliate with a puppet who chose the same toys as themselves relative to a puppet who chose other toys and they modified their subsequent behavior by choosing the same toys as that puppet when presented with novel toys. Toddlers' actions were not based on perceivable features of the puppet (e.g., similar accent or language as oneself) or an association between the puppet and the preferred toys (as assessed in a control condition). Results indicate that toddlers identified and recognized the similarity in action choices between themselves and the puppet via comparison between their own and the puppets' actions. Identifying this similarity is critical for children's developing understanding of and engagement in interactions with others.