PEER INSTRUCTION: TURNING A LECTURE INTO A SEMINAR …We have a problem 380,000 students take introductory physics each year… AIP Report R-151.33(1997)

PEER INSTRUCTION:TURNING A LECTURE INTO A SEMINAR

Catherine H. Crouch

Harvard University

Indiana University of Pennsylvania21 July 1999

Outline

Problem

Outline

Problem

Cause

Outline

Problem

Cause

Remedy

We have a problem

380,000 students take

introductory physics

each year…

AIP Report R-151.33 (1997)

We have a problem

about 1% of these get

a bachelor’s degree

in physics

AIP Report R-151.33 (1997)

We have a problem

Of the 4,300 students with

a bachelor’s degree

in physics…

AIP Report R-151.33 (1997)AIP Report R-151.33 (1997)

We have a problem

about 35% go on to get a

Ph.D. in physics…

AIP Report R-151.33 (1997)

We have a problem

That’s one out of every

260 students in our

introductory

courses!

We have a problem

What about the

other 259…?

We have a problem

What do we know

about these

students?

We have a problem

They know the jargon:

circular motion

barometric pressure

light radius

something to the power times ten to the something

We have a problem

They are aware of their lack of knowledge

I graduated from college but I didn’t study astronomy

It’s been a while since I’ve had physics

We have a problem

They are aware of their lack of knowledge

…and they don’t care!

I graduated from college but I didn’t study astronomy

It’s been a while since I’ve had physics

We have a problem

Should we worry?

We have a problem

We’d better!

We have a problem

“I took four years of science and fouryears of math…

A waste of my time, a waste of the teacher’s time, and a waste of space…

You know, I took physics.

For what?”

We have a problem

Some disturbing symptoms:

frustration

lack of understanding

lack of basic knowledge

Why do we have this problem?


Lectures focus on transfer of information…


…but physics is not just information!

25

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1990FCI pretest

Hestenes, et al., TPT 30, 141 (1992)



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R.R. Hake, Am. J. Phys. 66, 64 (1998)


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g = Sf – Si1 – Si

R.R. Hake, Am. J. Phys. 66, 64 (1998)


Conventional problems reinforce bad study habits



12 V

8 V

4 Ω

2 Ω

6 Ω

QP

H



12 V

8 V

4 Ω

2 Ω

6 Ω

QP

H

Calculate:

(a) the current in the 2-Ωresistor, and

(b) the potential differencebetween points P and Q


Are basic principles understood?

S

AB

C

H


Are basic principles understood?

S

AB

C

H

When S is closed, what happensto the:

(a) intensities of A and B? (b) intensity of C? (c) current through battery? (d) voltage drop across

A, B, and C? (e) total power dissipated?


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conventional conceptual


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9%

52%

39%

So what should we do?

Peer Instruction

Help students take more responsibility for learning!

Peer Instruction

Move first exposure to the material out of the classroom…

Peer Instruction

Move first exposure to the material out of the classroom: assign reading!

Peer Instruction


Use class to deepen and broaden understanding

Peer Instruction



by identifying key ideas

Peer Instruction



by identifying key ideas

and giving students opportunities to think

Peer Instruction

Main features:

Pre-class reading

Reading

Web-based assignment due before class

Reading


Three questions (content and feedback)

Reading



Graded on effort

Reading



Graded on effort

5% of final grade

Peer Instruction

Main features:

Pre-class reading

In class: depth, not coverage

Peer Instruction

Main features:

Pre-class reading

In class: depth, not coverage

ConcepTests

ConcepTest

1. Question

2. Thinking

3. Individual answer

4. Peer discussion

5. Group answer

6. Explanation

Sample ConcepTest

Consider an object that floats inwater but sinks in oil. When theobject floats in water, half of it issubmerged.

If we slowly pour oil on top of thewater so it completely covers theobject, the object

1. moves up.

2. stays in the same place.

3. moves down.

Motivating students

Suitable ConcepTests

Motivating students


Rewards for participation

Motivating students



Noncompetitive grading

Motivating students



Noncompetitive grading

Conceptual exam questions

Is it any good?

Is it any good?

Results

Is it any good?

Results

Student Reactions

Results

25

20

15

10

5

0252015

score

1050

cou

nt

1991FCI pretest

Results

25

20

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10

5

0252015

score

1050

cou

nt

1991FCI posttest

Results

25

20

15

10

5

0252015

score

1050

cou

nt

1991combined

Results

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200


0

perfect score

1.00

0.23


Results

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200


0

perfect score

1.00

0.23


Results

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200


0

perfect score

1.00

0.23


R.R. Hake, Am. J. Phys. 66, 64 (1998)

Results

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200


0

perfect score

1.00

0.23


0.48

R.R. Hake, Am. J. Phys. 66, 64 (1998)

Results

What about problem solving…?

Results

25

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01008060

exam score (%)

40200

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1985exam scores

Results

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01008060

exam score (%)

40200

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1991exam scores

Results

25

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01008060

exam score (%)

40200

cou

nt

1985/91exam scores

Why it works for students

focuses students on understanding



gets students thinking




uncovers misunderstandings




uncovers misunderstandings

builds confidence

Why it works for instructors


modification, not drastic change



adaptable



adaptable

resources (http://galileo.harvard.edu)

Results

So better understanding leads to better

problem solving!

Results

So better understanding leads to better

problem solving!

(but “good” problem solving doesn’t always

indicate understanding!)

Conclusion

Let’s not forget the base

of the pyramid!

Conclusion

Let’s help them learn what

science is all about!

Conclusion

skepticism

growing pains

Challenges:

Conclusion

engagement

improved understanding

class is fun!

Rewards:

Funding

National Science Foundation

For a copy of this talk andadditional information:

http://mazur-www.harvard.edu

Documents

PEER INSTRUCTION: TURNING A LECTURE INTO A SEMINAR …We have a problem 380,000 students take introductory physics each year… AIP Report R-151.33(1997)