Eight common errors I see in PhD applications and interviews, and how to avoid them

"Many applicants focus entirely on why they care about a field. These stories can be moving and sincere, but they rarely tell me what the applicant wants to study or how they think scientifically. By 'what do you want to study?', I mean having even a broad sense of the questions or themes that interest you. By 'how do you think scientifically?', I mean showing how you approach problems, make decisions and reason through uncertainty."

"These mistakes are not about grades or awards. They are about how applicants communicate, present their ideas and engage with the research environments that they want to join. Although my perspective comes from a background in psychology and health research, the applicants to my Health Equity and Action Lab at the University of Illinois come from a variety of fields because of the interdisciplinary nature of our work."

A laboratory director reviewing hundreds of PhD applications annually identifies recurring mistakes in how applicants communicate and present themselves. These errors stem not from academic credentials but from how applicants articulate their research interests and engage with potential research environments. Common application mistakes include writing personal statements focused solely on emotional connection to a field rather than specific research questions or scientific reasoning. Applicants often fail to demonstrate their approach to problem-solving and decision-making under uncertainty. The patterns observed span multiple disciplines despite varying field-specific expectations. Understanding these mistakes helps applicants strengthen their candidacy by moving beyond personal narratives to showcase genuine scientific thinking and clear research direction.

Read at Nature