Adult patients with a low-grade glioma, either histologically proven, or suspected (1), as well as adult anaplastic glioma patients with favorable prognostic factors (2), who are clinically stable for at least 6 months, will be recruited from 9 hospitals in the Netherlands. Consenting patients with both subjective cognitive symptoms and objective deficits will be randomized to either the cognitive rehabilitation program (N = 75) or a "waiting-list" control group (N = 75). Upon completion of the study, those patients assigned to the control group will be given the opportunity to undergo the cognitive rehabilitation program.