Exercise 3 - Mensch-Maschine-Interaktion 1 (MMI 1)
Wintersemester 2008/09

Exercise 3 - MMI 1

Topic: Law of Steering

5. Reading

a) Read the paper Beyond Fitts' law: models for trajectory-based HCI tasks by Accot and Zhai (1997) and write a short summary (100-200 words).

b) Can you find a tunnel shape where the Law of Steering certainly won't work?

6. Law of Steering (2/2)

The Law of Steering predicts how long it takes a user to navigate a pointer through a tunnel. For a straight tunnel with length A and constant width W, the average time to pass ist is a + b * A/W. The term A/W is called index of difficulty (ID).
Verify the validity of the law with a small study and find out a and b for the different movement directions (you should have a working test application by now):
Afterwards, analyze the data:
Thoroughly document the experiment and the analysis. Include a screenshot and all graphs. Submit the raw data in separate files.

Submission

Submit your solution via UniWorx.
Unless otherwise specified, all files have to be either Adobe PDF or UTF-8 plain text. All other files will be automatically deleted.
Please put all files concerning one sub-task of this assignment into a sub-folder inside the ZIP file.

Schema/Example:
./
5/
a/
summary.txt
b/
further_questions.txt
6/
report.pdf
raw_data_00.csv
raw_data_01.csv
Do not use any other directory layout.

Deadline: Monday, 03.11.2008, 09:00 (UTC+2)