Although it is important to compare the effectiveness of treatments, it was not the focus of the current meta-analysis. The study reported estimates of inattention in daily life pre- and post-training for intervention and control groups. We did not include studies where time between training completion and the follow-up assessment differed for intervention and control groups, e.g. Ludqvist et al. collected estimates of inattention in daily life for the intervention group 20 weeks after training completion and for the control group 4 weeks after training. The study reported means, standard deviations and sample sizes for estimates of inattention in daily life, so that effect sizes could be calculated, and in the case that this information was not reported we contacted authors to obtain information. We contacted the authors of three studies to obtain additional information about posttraining scores: one study was not included in the primary analysis because the authors indicated that there was too much missing data to report scores, and one study was not included in the long-term follow up analysis because at the time of submission the information required to 4-IPP perform the analysis had not been obtained. The study data had not been previously reported, to avoid duplication. We considered studies of participants of any age and status. We did not include studies that recruited participants differing on these characteristics, e.g. L?haugen et al. compared a group of adolescents born extremely low birth weight who had completed the Cogmed program with a control group of adolescents born normal birth weight. It was therefore inappropriate to compare groups on post-training estimates of inattention in daily life because groups differed at baseline on important variables. Initially titles and 5-Fluoroorotic acid abstracts were reviewed for inclusion criteria and then full articles. Articles were reviewed by MSS and TK and excluded if they did not meet all criteria. Any discrepancies were resolved by discussion. The major finding of this meta-analysis is that benefits of aWMtraining program generalise to improvements in everyday functioning. We showed that inattention in daily life was significantly improved after completing the Cogmed program compared with a control program. The training effect was-0.47 SMD. Whether a significant and moderate training effect on inattention in daily life is adequate given the time and effort of a training program is open to discussion. Many existing pharmacological treatments for behavioural aspects of common clinical disorders, such as antidepressant medications and cholinesterase inhibitors for Alzheimers disease, have an effect size of around 0.3 or less. In education, interventions with an effect size of 0.25 are considered useful.