Participant IDs (Codes)

You will be identified by number

You need a number. For the number use the last four digits of your phone number or student ID. With luck, those will all be different. (Bonus probability problem for you: Assuming all four-digit numbers are equally likely, what is the probability that two of you have the same number. Example: If you phone number is 616-355-5347, then your number is 5347.

Each subject will be identified by letter.

Each subject will need a letter A through X. We’ll use these letters for two things: to identify games played by the same person, and to determine the order in which the games are played (see below). So you don’t all start at the same letter, go around the room and ``letter off’’. The first person says “A”, the second person “B”, etc. Use that letter for your first subject and then for each addition subject, move to the next letter. (If you get to the end of the alphabet, start over at A.)

Data collection protocol

Now that you have your number and a starting letter, you are ready to collect some data. Each person in the class should have at least 3 subjects play each game. You can be your own first subject. (But you can’t also be someone else’s subject.) Be your own subject during class and then you can get additional subjects by 9pm Sunday night.

Here’s the plan for each subject.


Have the subject (possibly you) practice with the game until they are comfortable with how the game works. Have the subject try some of the variations as well as the basic version. Here are the links:

Enter some information

You will be prompted for some information before the game can begin.

Paricipant ID: Assign each person an ID consisting of the last four digits of your student id or telephone number, a dash (-), and a letter of the alphabet. For example, if your phone number ends 5347, then your subjects will have IDs like 5347-D or 5347-X. (We want something that makes it easy to keep subjects together and allows you to find the subjects you worked with.) If you have fun with this and gets lots of subjects, once you go beyond 24, you can use codes like AA, AB, AC, etc. for the additional subjects.

Use the chart below to determine the order of the games. But don’t all start at the same letter or you will all use the same pattern. You can go around the room and “letter off” so that each person starts with a different letter.

  A B C D E F G H I J K L M N O P Q R S T U V W X
1 3 4 2 2 3 3 4 2 2 4 1 1 2 2 4 1 1 4 3 3 1 1 4 3
2 4 3 3 3 2 2 2 4 4 2 2 2 1 1 1 4 4 1 1 1 3 3 3 4
3 2 2 4 1 1 4 3 3 1 1 4 3 3 4 2 2 3 3 4 2 2 4 1 1
4 1 1 1 4 4 1 1 1 3 3 3 4 4 3 3 3 2 2 2 4 4 2 2 2

If you get letter G and our number code is 5437, for example, then your first subject will be 5437-G and do the games in the order 3, 4, 2, 1. Then you will move to participant (5437-H).

sex: enter M or F (for male or female)

device: enter mouse, track (for track pad) touch (for touch screen)

age: age of subject in years.


Once the information has been entered, hit the play button to begin the game. The system will take care of recording all the data.

If a subject wants to do a second round, that’s fine. Just have the subject play more times. Be sure to keep the same ID for that subject no matter how many times they play. We can use the time stamp information to determine which play came first, second, etc.

Looking at the data

If you want to check that things are working, you click on Query database and use C145F14 for the group code. You should see all the data from our class (for that game).