This paper describes the structures, thermal-expansion properties and phase transitions of the trigonal forms of ZrMo(2)O(8) and HfMo(2)O(8). Both phases adopt a P(-)3m structure at room temperature and show positive thermal expansion. Both phases also undergo a displacive phase transition at high temperature (ZrMo(2)O(8) at 487 K and HfMo(2)O(8) at 463 K) to a higher-symmetry structure that has lower thermal expansion. The structure of the high-temperature alpha'-AMo(2)O(8) form (A = Zr and Hf) has been refined from powder diffraction data in space group P(-)3m1.

Objective: To synthesize the evidence on the efficacy of ADHD teacher training interventions for teachers’ ADHD knowledge and reducing pupils’ ADHD-type behaviors. Method: Six electronic databases were systematically searched up to 14/04/20. Meta-analyses were performed to pool standardized mean differences (SMD). Results: 29 studies were included in the systematic review, and 22 meta-analyzed. SMD for teacher knowledge within subjects at post-test and follow-up was 1.96 (95% confidence interval = 1.48, 2.43) and ‒1.21 (–2.02, –0.41) respectively. Between subjects analyses at post-test showed SMD = 1.56 (0.52, 2.59), with insufficient data at follow-up. At post-test, SMD for pupils’ behavior within and between subjects was 0.78 (0.37, 1.18), and 0.71 (–0.11, 1.52), respectively. Medium-to-high risk of bias was found in all but one study. Conclusion: ADHD teacher training programs may be effective in initially improving ADHD teachers’ knowledge. There is inconsistent evidence for their efficacy to reduce students’ ADHD-type behaviors.

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Teachers report feeling ill-equipped to meet the needs of ADHD children. Previous studies on ADHD teacher training have been largely quantitative, focused on measured gains in ADHD knowledge and use of behavioural strategies. Traditional training shows initial improvements which deteriorate over time necessitating a new approach. Staff perspectives identifying important factors in teaching children with ADHD and staff training are largely missing from the literature. Semi-structured interviews were conducted with 19 primary staff in England. Interviews were analysed using a reflexive thematic approach. Five themes are reported: being equipped to provide for the individual needs of children with ADHD; a joined-up team approach which draws on the knowledge of others; creating the opportunity for every child to succeed; supporting all children in the classroom; training and support which meets the needs of all school staff. Findings will enable ADHD training to be better tailored to meet school staff's needs.

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