Implementation of the official protocol --------------------------------------- **Experimenters** *All 8 experimenters are experienced research assistants with specific experience in experimental research. As preparation for data collection all research assistants were asked to familiarize themselves with the protocol. Remaining questions or ambiguities were clarified in a subsequent meeting with the Potsdam lab researchers. The research assistants were remotely familiar with the concept of ego depletion due to their university studies and their work at the Potsdam lab. Nevertheless, only two of the experimenters were familiar with the purpose of the study. These two were only assigned to testing if there was no other research assistant available to maximize the amount of blind sessions. Hence, we changed the instruction for the experimenters in the step-by-step procedure from ‘easy’ and ‘hard’ condition to condition ‘1’ and ‘2’, as it was already discussed in google groups to ensure blinding of the experimenters. The same was done with the name for the Eprime files.* **Piloting / training** *To ensure that the protocol was understood and worked smoothly, two researcher from our group that were not involved in the data collection served as pilot participants. Piloting was supervised by Wanja Wolff.* **Experimenter knowledge of expected outcomes** *All research assistants are familiar - at least to a basic level - with the concept of ego depletion. However, they are not completely informed about the experimental design. As stated above, only two experimenters are familiar with the studies' goal. Whether or not one of these experimenters was doing the testing will be logged. For all non-informed experimenters, we will collect post-hoc information on the experimenters knowledge/estimates regarding the experimental conditions.* **Recruiting** *All participants will be undergraduate students. Some of them will participate in the experiment as part of their course requirements, others will be volunteers that will get a little reward (candy) following the experiment. The study will be described to them as being on “word and number recognition and reaction time”.* **Sample, subjects, and randomization** *We plan to test 110 subjects. This is the number of students that partake in the candidate undergraduate courses plus the additionally sampled volunteers. We will use Random.org to generate a pseudo-random sequence with the length of the planned number of subjects. As suggested we will run participants in blocks of 10 until we have more than 50 in each condition that are 18 to 30 years old and until between 30% and 70% are female). We will proceed with sampling until all candidate participants have been tested. To ensure that German is their native language we will collect demographics at the beginning (age, gender, native language). Participants that are not German native speakers will be excluded. Further data exclusion will follow the protocol as well. We will generate a pseudo-random sequence and assign participants accordingly. In case we have to collect additional data we will again run blocks of 10 participants with 5 randomly assigned to each condition until both conditions have at least the minimum sample size.* **Setting/Lab/Equipment** *We have a room with four cubicles and another room with an additional cubicle. We will test at most two participants at a time, the two participants will be in the different rooms. In order to implement the protocol accurately the experimenters will prepare the labs as described in the step-by-step-procedure. At first they will note gender, age and mother tongue of the partecipants on the randomization list. The consent form will be filled out as it is available in the German translation. Then, to the partecipants will be presented the practice version of the letter ‘e’task and the practice version of the MSIT. We used the German versions of .ebs2 files uploaded by Katrin Rentzsch 2015-04-14 into the German translations folder on the respective OSF page. As discussed in google groups we will rename the conditions of the letter ‘e’ task as ‘1’ and ‘2’ instead of ‘easy’ and ‘hard’ in order to not unveil any information that could influence the data. To ensure the blinding of the experimenters, the step-by-step procedure will be adapted as well. After the partecipants will have completed the practice trials, the experimenter will make sure that each task is understood and start the main version of the letter ‘e’ task. Afterwards the questionnaire for the manipulation check will be started by opening a link to ww3.unipark.de with Mozilla Firefox Internet Browser. We decided to use this online tool to avoid transmission error that could result from the trancription of paper-pencil-questionnaires to Excel or SPSS. Therefore we had to adapt the instruction from ‘Below each question, please circle the applicable response (a number).’ to ‘Below each question, please click the applicable response (a number).’ (German translation: ‘Bitte klicken Sie unter jeder Frage die zutreffende Antwort an (eine Zahl).’ instead of ‘Bitte umkreisen Sie unter jeder Frage die zutreffende Antwort (eine Zahl).’). As soon as the participants will have finished the questionnaire they will be asked to take part to the last part of the experiment for the MSIT (before starting with the MSIT the understanding of instructions will be assured once again). At the end of the experiment to the participants will be asked what were their assumptions concerning the purpose of the study. In accordance with our ethical approval, after the experiment is over, the experimenter will express appreciation for participating in the experiment and will provide a full debriefing to the participant (the German debriefing is on the OSF page for the German translations). During the whole course of the experiment, experimenters are urged to follow the step-by-step procedure to give appropriate and similar instructions to all partecipants. We adapted the procedure just to complete it with file names, we added informations on how to close EPrime after the experiment is finished, how to enter participant number and session number (always equal 1) and to urge experimenters to copy data after every course in a backup folder to avoid data loss. While the partecipants conduct the experiment's tasks, the experimenter will leave the room and will be called back in by the ring of a bell. All computers that will be used are Lenovo Desktop (Windows 7). We will use the EPrime 2.0.*