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DesigningDesigningChallenge QuestionsChallenge Questions
One Difference BetweenOne Difference BetweenChallenge-Based and Challenge-Based and
Taxonomy-Based Taxonomy-Based InstructionInstruction
The order that material is The order that material is presented is reversed.presented is reversed.
Taxonomy-Based Taxonomy-Based InstructionInstruction
Start with a general principle, Start with a general principle, illustrate it with specific casesillustrate it with specific cases
e.g., derive the Navier-Stokes Eq.,then apply it to flow in an artery
Challenge-Based Challenge-Based InstructionInstruction
Start with a specific case:Start with a specific case:Students do not have sufficient Students do not have sufficient background to adequately address the background to adequately address the challenge on their ownchallenge on their ownDesign activities that bring in relevant Design activities that bring in relevant portions of the taxonomyportions of the taxonomy BBuild up to general principlesuild up to general principles
Best Way to DesignBest Way to Designan Effective Challengean Effective Challenge
Design an effective summative Design an effective summative assessment problem that tests students’ assessment problem that tests students’ mastery of the module objectivesmastery of the module objectives Use an old Homework ProblemUse an old Homework Problem Use an old Exam ProblemUse an old Exam Problem Examine Court CasesExamine Court Cases
Examples ofExamples ofChallengesChallenges
BiomechanicsBiomechanics
andand
BiotransportBiotransport
ChallengeChallenge
A man is free to move A man is free to move his torso about an his torso about an AP axis in the AP axis in the frontal plane. When frontal plane. When will he lose his will he lose his balance?balance?
Why don’t these Why don’t these people fall over?people fall over?
Challenge: Why does a vertebra Challenge: Why does a vertebra fail along a 45 degree angle fail along a 45 degree angle during axial compression?during axial compression?
R
R
R
R
Bungee JumpingBungee Jumpingandand
Pennsylvania LawPennsylvania Law
How can we design a bungee cord to How can we design a bungee cord to meet Pennsylvania State codes?meet Pennsylvania State codes?
Iron Cross ChallengeIron Cross Challenge
What muscle strength is needed for an athlete to hold this position?
Design of a Design of a rapid reaction apparatusrapid reaction apparatus
You want to study the reaction A + B You want to study the reaction A + B AB using the apparatus AB using the apparatus below.below.
The reaction is thought to be virtually complete in The reaction is thought to be virtually complete in ττ seconds. seconds.What flow rate would you suggest (QWhat flow rate would you suggest (QAA=Q=QBB)?)?What size syringe (volume) do you need for an experiment that What size syringe (volume) do you need for an experiment that
lasts 5lasts 5ττ??Challenge:Challenge: You need to purchase syringes for this experiment. You need to purchase syringes for this experiment.
High pressure syringes are expensive. What is the minimum High pressure syringes are expensive. What is the minimum pressure rating required for this application?pressure rating required for this application?
Probes that measure A, B, or AB
Smooth, square duct200 cm long
d = 0.3cm
A
B
Determinants of Cell SizeDeterminants of Cell Size
Why are cells so small?Why are cells so small?
What factors limit the ultimate size of cells?What factors limit the ultimate size of cells?
Effectiveness: Control vs. CBIEffectiveness: Control vs. CBI
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
Question Difficulty
Eff
ect
Siz
e
More DifficultLess Difficult
Average
CBI
Control
*
*p < 0.05
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*
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*
*
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* *** *