memorization or understanding: are we teaching the … · 2019. 7. 24. · eric mazur university of...

MEMORIZATION OR UNDERSTANDING:ARE WE TEACHING THE RIGHT THING?

Eric Mazur

University of Victoria19 May 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

Some disturbing symptoms:

frustration

lack of understanding

lack of basic knowledge

We have a problem

Well, “hot” is a relative term…

You see, given temperatures rise, regardless of mass.

Yeah, Galileo observed rising temperatures will decreasewith the exposure of an endothermic source.

Endothermic?

True transparence will persist until this one irresistiblecalorie interacts, thus altering the system.

We have a problem

Well, “hot” is a relative term…

You see, given temperatures rise, regardless of mass.

Yeah, Galileo observed rising temperatures will decreasewith the exposure of an endothermic source.

Endothermic?

True transparence will persist until this one irresistiblecalorie interacts, thus altering the system.

Uh huh…

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?”

Why do we have this problem?

Why do we have this problem?

Lectures focus on transfer of information…

Why do we have this problem?

…but physics is not just information!

25

20

15

10

5

0252015

score

1050

cou

nt

1990FCI pretest

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

Why do we have this problem?

…but physics is not just information!

25

20

15

10

5

0252015

score

1050

cou

nt

1990FCI posttest

Why do we have this problem?

…but physics is not just information!

25

20

15

10

5

0252015

score

1050

cou

nt

1990combined

Why do we have this problem?

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200

initial score, Si (%)

0

1990combined

Why do we have this problem?

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200

initial score, Si (%)

0

1990combined

Why do we have this problem?

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200

initial score, Si (%)

0

perfect score

Why do we have this problem?

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200

initial score, Si (%)

0

perfect score

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

Why do we have this problem?

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200

initial score, Si (%)

0

perfect score

1.00

0.23

g = Sf – Si1 – Si

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

Why do we have this problem?

Conventional problems reinforce bad study habits

Why do we have this problem?

Conventional problems reinforce bad study habits

12 V

8 V

4 Ω

2 Ω

6 Ω

QP

H

Why do we have this problem?

Conventional problems reinforce bad study habits

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

Why do we have this problem?

Are basic principles understood?

S

AB

C

H

Why do we have this problem?

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?

Why do we have this problem?

00

20

40

60

80

2 4 6 8 10score

coun

t

00

20

40

60

80

2 4 6 8 10score

coun

t

conventional conceptual

Why do we have this problem?

00

20

40

60

80

2 4 6 8 10score

average 4.9average 6.9

coun

t

00

20

40

60

80

2 4 6 8 10score

coun

t

conventional conceptual

Why do we have this problem?

100

80

60

40

20conc

eptu

al p

robl

em

100806040200

conventional problem

0

Why do we have this problem?

100

80

60

40

20conc

eptu

al p

robl

em

100806040200

conventional problem

0

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

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

Use class to deepen and broaden understanding

Peer Instruction

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

Use class to deepen and broaden understanding

by identifying key ideas

Peer Instruction

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

Use class to deepen and broaden understanding

by identifying key ideas

and giving students opportunities to think

Peer Instruction

Main features:

Pre-class reading

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

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

15

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

initial score, Si (%)

0

perfect score

1.00

0.23

g = Sf – Si1 – Si

Results

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200

initial score, Si (%)

0

perfect score

1.00

0.23

g = Sf – Si1 – Si

Results

100

80

60

40

20

chan

ge in

sco

re, S

f – S

i (%

)

100806040200

initial score, Si (%)

0

perfect score

1.00

0.23

g = Sf – Si1 – Si

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

initial score, Si (%)

0

perfect score

1.00

0.23

g = Sf – Si1 – Si

0.48

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

Results

What about problem solving…?

Results

25

20

15

10

5

01008060

exam score (%)

40200

cou

nt

1985exam scores

Results

25

20

15

10

5

01008060

exam score (%)

40200

cou

nt

1991exam scores

Results

25

20

15

10

5

01008060

exam score (%)

40200

cou

nt

1985/91exam scores

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 give them something

of value!

Conclusion

internal skepticism

growing pains

limited circle of influence

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