Open community authoring of targeted worked example problems. Putting the world to work for ITS:. Aleahmad, Aleven and Kraut. Current situation in tutoring systems. Development is very laborious (e.g. estimates of 200-300 hrs for 1 hr instruction) Small groups with much effort per person
Open community authoring of targeted worked example problems
Putting the world to work for ITS:
Aleahmad, Aleven and Kraut
Zack and Slater want to build a bike jump. They have two parts of the ramp constructed but they need to know the length of the final piece of the jump. They have two parts of the ramp built, one is 3 ft long and the other is 4 ft long and they are constructed as shown in the diagram. What is the length of the missing section that Zack and Slater still need to construct?
The unknown is the hypotenus which is represented by c in the equation. Therefore I input both a and b into the equation first. Following the equation I square both of these numbers.
3^2 + 4^2
These two numbers are added together first because of the parenthesis.
9 + 16 = 25
Whole worked example
To complete the equation I take the square root of 25 which is five. This problem also demonstrates the common Pythagoras triangle.
Square root of 25 is 5 and this is the solution.
Profiles in experimental condition versus generic control condition
Some have just a worthless drawing.
Or nothing at all.
Human experts rated the machine vetted submissions
Probabilities of authoring matching an attribute
†p<.10 *p<.05 **p<.001
For profile with a home outside town
For profile who lives in tall apartment building
Verbal skill in profile
General math skill in profile
Correspondence of verbal and math skill levels with the authoring interface
Shakespeare for profile in “top of English class”