Assignment 3

[Robert Walter]

hey,

here are the slides of the third assignment: https://dl.dropbox.com/u/5505209/mpi/03-fittslaw.pdf

and the exercise sheet: https://dl.dropbox.com/u/5505209/mpi/03-assignment.pdf

you will also need this one: https://dl.dropbox.com/u/5505209/mpi/FittsTemplate.pdf

as usual, you may use the google group for discussions.

note that the project phase of the course will start next week!

cheers

robert

[Christina Rickmann]

Hey,

are we allowed to do the Assignment 3 in plain Java or does it have to be Processing?

cheers
Chrissi

[Robert Walter]

unless you have found fitts' law experiment java code in the internet that you plan to copy, i wouldnt see a reason not to go for processing :-). it makes your life easier, not harder.

you can also use java + processing as a library if this is your question. sure its possible. its shown in older slides how to do this. of course you are not forced to use processing at all though.

cheers
rob

sent from my android

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[FM]

I'm a bit confused by exercise 1.1: "Also give one examples of a pointing task where Fitts' law does not apply and explain why!"
Do we have to find one example, which is not usable because Fitts' Law obviously wasn't considered? Or should we explain an example where the opposite of Fitts' Law is the best design decision?

[Robert Walter]

you should find an example of a pointing task where it is invalid to apply fitts' law in order to measure performance. 

2012/12/5 FM <friedric...@campus.tu-berlin.de>

I'm a bit confused by exercise 1.1: "Also give one examples of a pointing task where Fitts' law does not apply and explain why!"
Do we have to find one example, which is not usable because Fitts' Law obviously wasn't considered? Or should we explain an example where the opposite of Fitts' Law is the best design decision?

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[AJ]

Hello! I wasn't there the day when the slides for assignment 3 were announced and I'm trying to do my calculations about it now. I'm having difficulties to calculate the parameters a and b (Exercise 3b). Can you please help me or give a concrete example of how to do this? Thank you!

[Moritz Lawitschka]

Are we forced to use either Java or Processing? I'm way faster writing an HTML app for this purpose and thus would be able to make it cross-platform easily :)

[Robert Walter]

you are not forced to anything .. as long as i'm able to run in the end :)

[Moritz Lawitschka]

I'd deploy it to a server, so you wouldn't have to run it locally unless you really want to :)

[Michalis Adamidis]

Hmm well maybe I missed something but where are the results for this assignment?

Am Dienstag, 27. November 2012 12:27:10 UTC+1 schrieb Robert Walter:

[Robert Walter]

finally, results are there! sorry for the small delay :)

https://docs.google.com/spreadsheet/pub?key=0AlV0ncVP5G7rdFE4NmFWQkplV2UzV2JUbXNlb0FpVUE&single=true&gid=5&output=html

[jo_nas]

What a well designed table! Did it pass every step of DIA? Or are you just teaching these kind of things? ;)

[Michi]

Hi Robert,

we didn't get any points on the Non-Fitt's task example. Could you give an example for such a task, please?

Best
Michi

[Robert Walter]

one very basic example would be, when the user can not (always) reach the target with one movement (hand-eye coordination loop), but rather with a series of smaller movements. more specifically: image you have a very slow mouse and in order to go from one side of the screen to the other, you have lift and reposition the mouse a couple of times. fitts' law would fail on that one because sometimes you can reach targets with one movement and sometimes you can not.

2013/2/9 Michi <michit...@googlemail.com>

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[Michi]

Thanks!

[Volker Jung]

NOBODY can design a table like THAT without at least three DIA-cycles...