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A fundamental diiculty in automatic formal veriication of nite-state systems is the state explosion problem { even relatively simple systems can produce very large state spaces, causing great dii-culties for methods that rely on explicit state enumeration. We address the problem by exploiting structural symmetries in the description of the system to be veriied. We make symmetries easy to detect...

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Four randomised controlled trials (RCTs) and one RCT metaanalysis are featured in the Journal this month. The latter is a review of trials of newer-generation antidepressants and cognitive–behavioural therapy (CBT) for adolescent depression (Dubicka et al, pp. 433–440). In an area of clinical practice plagued by controversy, the authors of this review were able to contribute the finding that ad...

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The goal of the Alewife experiment is to demonstrate that a parallel computer system can be made both scalable and easily programmable. Scalability will be achieved through an architecture that allows the exploitation of locality. That is, for programs that display communication locality, scalable machines can o er proportionally better performance with more processing nodes. A program running ...

A22 22..22

Three papers in the Journal this month consider issues related to measuring, understanding and treating mental ill health in childhood. Baron-Cohen et al (pp. 500–509) undertook a study to establish the prevalence of autism-spectrum conditions in Cambridgeshire using two case ascertainment methods. First, a survey of individuals on the Special Educational Needs register and second, a screening ...