Learning strategies for everyday goals

Intervention: The investigational treatment is based on the standard GMT. The investigational treatment will have an errorless learning approach meaning that both learning and applying the algorithm of GMT will be learned errorless. This means that the multiple steps of the GMT as well as the actual performance of the IADL-tasks will be learned without the occurrence of errors under guidance of a therapist. In standard GMT (comparator) errors do occur. Patients will learn to use algorithm and the performance of the tasks using trial and error. The therapist is in this group not responsible for preventing errors during learning and applying GMT. Both types of GMT will consist of 8 sessions (max. 60 minutes) and will be given twice a week. Primary outcome: The main study parameter is a standardized scale measuring performance of IADL tasks before (baseline) and after treatment (post treatment). IADL tasks will be divided into multiple steps using the GMT method. These step will be assessed using three categories: 1) competent; 2) questionable/ineffective 3) deficit, using task-specific assessment forms. Secondary outcome: A secondary study parameter is the subjective experience of cognitive deficits of participants, measured by the Goal Attainment Scale (GAS) and is performed before the intervention (baseline), immediately after the intervention (post-treatment) and 4 months later (follow-up) . Goal attainment scaling is a mathematical technique for quantifying the achievement of goals set, used in rehabilitation. GAS is described as a method of scoring the extent to which patient*s individual goals are achieved in the course of the intervention. In effect, each patient has own outcome measures, but this is scored in a standardized way as to allow statistical analysis.