Table 1 Content of GMT sessions for both treatment arms

Providing information about training;

Providing information about cognitive functioning after acquired brain injury in general with an emphasis on executive impairments;

Increasing awareness of individual executive dysfunction;

Preparing the setting of two individual treatment goals

Setting two individual chosen treatment goals (i)ADL tasks);

Filling out the Goal Attainment Scale forms for each treatment goal

GMT-errorless learning

Conventional GMT-treatment

Defining steps concerning treatment goal 1 using cue cards and other errorless learning techniques

General information about GMT and the GMT algorithm

Defining steps concerning treatment goal 2 using cue cards and other errorless learning techniques

Filling out GMT scheme by participant concerning treatment goal 1

Performance of the steps concerning treatment goal 1 using errorless learning techniques

Filling out GMT scheme by participant concerning treatment goal 2

Performance of the steps concerning treatment goal 2 using errorless learning techniques

Performance of treatment goal 1 according to the GMT algorithm

Integrating the steps of treatment goal 1 into the GMT algorithm using errorless learning techniques;

Performance of treatment goal 2 according to the GMT algorithm

Performance of treatment goal 1 according to the GMT algorithm using errorless learning techniques

Integrating the steps of treatment goal 2 into the GMT algorithm using errorless learning techniques;

Improvement of GMT schemes concerning one or both of the treatment goals and/or practicing performance of one or both of the treatment goals

Performance of treatment goal 2 according to the GMT algorithm using errorless learning techniques