In this article we report the findings of a randomised control clinical trial that assessed the impact of a Philosophy for Children program and replicated a previous study conducted in Scotland by Topping and Trickey. A Cognitive Abilities Test (CAT in the UK or CogAT in the USA) was administered as a pretest and a posttest to randomly selected experimental groups (N = 363, 186 seventh graders + 177 eighth graders) and control groups (N = 177, 79 seventh graders + 98 eighth graders). The students in the experimental group engaged in philosophy lessons in a setting of structured, collaborative inquiry in their language arts classes for one hour per week for a number of weeks. The control group received the standard language arts curriculum in that one hour. The study found that the seventh grade students who had experienced the P4C program showed significant gains relative to those in the seventh grade control group at a high level of statistical significance, but the eighth grade students in the experimental group did not show such gains over the eighth grade control group. It was discovered that the seventh grade teachers started the program early in the school year and continued it for a period of 22 to 26 weeks, while the eighth grade teachers started much later and used the program for only 4 to 10 weeks. Our findings suggest that the P4C program must involve students in activities for a significant period of time before the program shows results, but that a meaningful impact on students’ cognitive abilities can be achieved in about 24 weeks of lessons, less than half the time evidenced by the study by Topping and Trickey.

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Three recent research reports by Topping and Trickey (2007a; 2007b), by Fair and colleagues (2015), and by Gorard, Siddiqui and Huat See (2015) have produced data that support the conclusion that a Philosophy for Children (P4C) program of one-hour-per-week structured discussions has a marked positive impact on students. This article presents data from a follow up study done three years after the completion of the study reported in Fair et al. (2015). The data show that the positive gains in scores on the Cognitive Abilities Test (CogAT in the USA and CAT in the UK) were still present and had not faded after three years. Given the strength of these confirmations of the positive durable impact of the P4C program of structured discussions and given the relatively low cost of implementing the P4C program, it is recommended that it become a standard part of the school curriculum.

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