Lecture Mode

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You are here: classEx --> Lecture Mode

Here's a quick overview of what you can do in the lecture mode. More detailed descriptions can be found below.

Top bar

The top bar of the lecture mode looks like this:


Here, you can find the following symbols:

- select game: By clicking on this, you can choose from all of your games. The selected game opens up as soon as you click on it.

- QR code symbol: Clicking on this symbol enlarges the QR code and provides an instruction for participants to enter without using the QR code.

- Testpart.JPG: Clicking on this opens a participant screen in a new tab. This can be very useful to test classEx games.

- Steto.PNG: This starts the Diagnosis mode. Here, you can see all variables for the lecturer and the players, which makes detecting programming errors much easier.

- data: drop down menu. By selecting show data, you can access a clients' table by clicking on , which shows you how many participants are logged in and what decision stage they are at. Clicking on "back to Lecture mode" takes you back to the current game.


- Download results: In the drop-down menu of data you can also download excel files containing the decisions made in the game you just played or, if available, old results of this same game. You can also download excel files containing an overview of roles, treatments & groups that existed in this game as well as participants’ IDs and their log-in time.


- previous results: this function lets you access results of the same game from previous lectures. This way you can directly compare current outcomes with previous ones.

Test a Game

Before playing a game in your lecture, you can test the game on your own PC by clicking on Testpart.JPG in the top bar of the lecture mode. This opens a participant screen in a new tab. You will see the game just as your subjects will see it when actually playing the game. You can open as many screens as you want, which enables you to also test interaction between participants in games with several roles.

Start a Game

During a lecture, the interaction between the lecturer and the participants takes place in the lecture mode. The lecturer’s browser is usually projected to a wall. Games are started and terminated in the lecture mode and the results are also displayed in this mode. The lecturer can start this game or select a different one.

The lecturer can select a new game by choosing it from the drop down list. The drop down list shows all available games. A selected game can be started by pressing:


By pressing start, the lecturer initiates the first stage of the game. If a game consists of several stages, the start button for the next stage appears after pressing the start button for the first stage.

The counter over the start button shows how many participants are currently logged in. There is no minimum number of players required to start a game.

If a game consists of several treatments and / or roles the participants will be placed into treatments / roles alternately. If the number of players is not a multiple of the group size, the programme code FindPartnerDecision (see Elements) can be equipped with a random argument, so that no players are excluded from the game.

During the Game

During the course of a stage, a display shows how many participants are logged in and how many of them have already made their decision in the current stage.


Here, 3 participants are logged in and 1 has already made their decision.

Tip: If you play a game with large groups, it can happen that participants take some time until they make their decision. You should wait for a while but then terminate the input phase and carry on if the added value of more input is fairly small.

End the Game

When the participants have made their decisions, the lecturer can end the game by clicking on „display results“.


If games are played for real money, the lecturer does not only have the normal „display results“ button but also the enhanced button "Display results and payoff". If you should not want to pay out any money, for example in a practice round, you have the possibility of clicking on “display results only” below the actual button.

Change parameters

You can now change the parameters of a game by clicking on Para.JPG. For example, in a public goods game, you can change the MPCR, the endowment and the amount of rounds and restart the game with the new settings. You can restart the game by clicking on Rere.JPG.

Graphical results


Some of the displayed figures and graphs can be adapted. All figures that are labelled with Highcharts.com (see bottom right corner of the figure above) have a zoom function. You can zoom in by simply clicking and pulling the mouse over the section you want to zoom in on. The button “Reset zoom” resets the display back to the original size.

For histograms, you can also change the settings for the bins and the maximum by clicking on the little symbol under the bottom left corner of the chart. You simply change the values in the fields and then click beside the bins display. This can be useful if the default bins’ size was too small (the bins are then changed for all graphs).

In the top right corner of the graph, you can see a symbol with three lines. Clicking on this symbol allows you to download the graph in different formats (jpeg, png, pdf, svg). You can also print the graph.

For the different result graphs see here.