IB Theory of Knowledge Topic 3.2.2 When Ethics Limits What We Can Know Revision Notes (SL/HL)

IB Theory of Knowledge Topic 3.2.2 When Ethics Limits What We Can Know Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

When Ethics Limits What We Can Know

In the human sciences, knowledge is cut off in three ways:
1. Method restrictions: some techniques are banned because they cause harm.
2. Topic taboos: some questions can’t be studied at all.
3. Participant protections: strict rules about consent and treatment.
These limits shape the scope, methods, and reliability of knowledge itself.

Definition

Ethical constraints

Systematic limitations designed to protect people, animals, or communities from harm in the process of knowledge production. They act as gatekeepers of what can (and cannot) be studied.

Method Restrictions Block Powerful Experiments

Method restrictions force researchers to use less effective approaches.
Sleep deprivation research is a great example of this.
We desperately need to understand how extreme fatigue affects critical decision-making, surgeons work for days straight, pilots fly exhausted, military personnel make life-or-death choices while sleep-deprived.
The ideal study would keep people awake for five days and test their judgment under pressure.
But of course, ethics boards allow only mild sleep loss studies of 24-48 hours maximum.
These are known as topic taboos, which emerge when any method to study a question would be inherently unethical.

Example

The nature-versus-nurture debate in criminal behavior exemplifies this.
Understanding whether people are born with criminal tendencies could reshape criminal justice systems worldwide but any definitive study would require raising children in controlled environments that promote criminal behavior.
The question obviously remains largely unanswerable, leaving us with incomplete twin studies and statistical correlations that satisfy no one.
Modern consent requirements mean researchers often study only people willing to participate in studies, potentially excluding those most relevant to understanding certain phenomena.

Tip

Modern consent requirements mean researchers often study only people willing to participate in studies.
These kinds of participant protection requirements can introduce sampling biases that limit knowledge reliability.
For example, people who volunteer for psychological studies tend to be more educated, more compliant, and less representative of general populations.
This means our knowledge about "human behavior" often reflects the behavior of college students willing to participate in experiments for course credit.

Topic Taboos Remove Entire Questions

Sometimes the barrier is not the method but the question itself.

Nice try, unfortunately this paywall isn't as easy to bypass as you think. Want to help devleop the site? Join the team at https://revisiondojo.com/join-us. exercitation voluptate cillum ullamco excepteur sint officia do tempor Lorem irure minim Lorem elit id voluptate reprehenderit voluptate laboris in nostrud qui non Lorem nostrud laborum culpa sit occaecat reprehenderit

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Unlock the rest of this chapter with a free account

When Ethics Limits What We Can Know

In the human sciences, knowledge is cut off in three ways:
1. Method restrictions: some techniques are banned because they cause harm.
2. Topic taboos: some questions can’t be studied at all.
3. Participant protections: strict rules about consent and treatment.
These limits shape the scope, methods, and reliability of knowledge itself.

Definition

Ethical constraints

Systematic limitations designed to protect people, animals, or communities from harm in the process of knowledge production. They act as gatekeepers of what can (and cannot) be studied.

Method Restrictions Block Powerful Experiments

Method restrictions force researchers to use less effective approaches.
Sleep deprivation research is a great example of this.
We desperately need to understand how extreme fatigue affects critical decision-making, surgeons work for days straight, pilots fly exhausted, military personnel make life-or-death choices while sleep-deprived.
The ideal study would keep people awake for five days and test their judgment under pressure.
But of course, ethics boards allow only mild sleep loss studies of 24-48 hours maximum.
These are known as topic taboos, which emerge when any method to study a question would be inherently unethical.

Example

The nature-versus-nurture debate in criminal behavior exemplifies this.
Understanding whether people are born with criminal tendencies could reshape criminal justice systems worldwide but any definitive study would require raising children in controlled environments that promote criminal behavior.
The question obviously remains largely unanswerable, leaving us with incomplete twin studies and statistical correlations that satisfy no one.
Modern consent requirements mean researchers often study only people willing to participate in studies, potentially excluding those most relevant to understanding certain phenomena.

Tip

Modern consent requirements mean researchers often study only people willing to participate in studies.
These kinds of participant protection requirements can introduce sampling biases that limit knowledge reliability.
For example, people who volunteer for psychological studies tend to be more educated, more compliant, and less representative of general populations.
This means our knowledge about "human behavior" often reflects the behavior of college students willing to participate in experiments for course credit.

Topic Taboos Remove Entire Questions

Sometimes the barrier is not the method but the question itself.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

1. Core Theme: Knowledge and the Knower2 subtopics

2. Optional Themes5 subtopics

3. Areas of Knowledge5 subtopics

4. TOK Assessments2 subtopics

6. Nov 2026 TOK Titles7 subtopics

IB Theory of Knowledge 3.2.2 When Ethics Limits What We Can Know Notes

1. Core Theme: Knowledge and the Knower2 subtopics

2. Optional Themes5 subtopics

3. Areas of Knowledge5 subtopics

4. TOK Assessments2 subtopics

6. Nov 2026 TOK Titles7 subtopics

When Ethics Limits What We Can Know

Method Restrictions Block Powerful Experiments

Topic Taboos Remove Entire Questions

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

When Ethics Limits What We Can Know

Method Restrictions Block Powerful Experiments

Topic Taboos Remove Entire Questions

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account