Stapel created entirely fake datasets instead of conducting real experiments. 

He often designed studies with others, but then said he'd collect the data himself. 

This violates the fundamental ethical principle of honesty in research and undermines scientific integrity.

In one example that the report cites, estimated data "obtained from some form or other of smoothing or curve fitting" was presented as the actual raw data. 

Stapel controlled the research process, giving students fabricated datasets instead of allowing them to collect real data.

He misled students into thinking they were fortunate to receive "pre-collected" data, depriving them of proper research experience.

When students questioned inconsistencies in the data, he dismissed their concerns or reacted with hostility.

He pressured students to write up results without questioning the validity of the data.

Many students unknowingly completed their degrees using fraudulent data, which could harm their academic integrity and future careers.

He discouraged students and colleagues from questioning his data.

He did not tolerate critical questions about his data

He fabricates the data by using his strategies which is collecting the data from other students and assistants and :find the opportunity to manipulate them before passing the data to others.

He collaborate with peer reviewers so that they did not report any manipulation that he made

Stapel deceived not only his students and colleagues but also academic journals, funding agencies, and the broader scientific community. This betrayal of trust weakens public confidence in scientific research.

By publishing fabricated results as if they were real, Stapel effectively engaged in plagiarism—stealing credit for research that never took place and misleading other researchers who built on his work.

The Importance of Research Integrity – Scientific research must be based on honesty, transparency, and real data to maintain credibility and trust.

Protecting the Integrity of Published Research – Journals and peer reviewers should enforce stricter requirements for data sharing and replication studies to detect fraud early.

Stapel was a highly influential figure in social psychology, publishing in top journals

Increased skepticism from the public: People may become more distrustful of scientific findings.

The fraudulent research practices of social psychologist Diederik Stapel have cast a negative light on the field of social psychology, which has faced multiple integrity issues

Some institutions redirected funding from social psychology to disciplines seen as more “robust” (Eg: natural sciences /engineering)

His fraudulent research wasted funding and resources that could have been used for legitimate studies. Additionally, other researchers may have based their own work on his false findings, leading to wasted time and effort.