Laboratory internship: discovering research by doing, from topic to final review

What sets a research internship apart

In a research internship, the job is not to apply a known procedure but to contribute to a question whose answer is not yet settled. The result may be positive, negative or inconclusive: a trial that fails is still information, provided it was carried out and recorded rigorously. That is what separates it from a conventional company assignment, where a deliverable is expected on a fixed date.

You find it in the third year of a bachelor's degree, the first year of a master's and especially the second year of a master's, as well as in engineering schools. It takes place in a university laboratory, a public research body, a hospital, or a company with a research and development department. It can also come before a doctorate, though one does not automatically lead to the other.

Reading a topic before accepting it

An internship topic should be read like a mini-project. Look for the question asked, the scientific context, the methods involved, the skills expected and the intended result. If the title contains several unfamiliar terms, look at one or two recent publications by the team: they show the work in progress and the vocabulary you need to master.

• Is the question precise enough to be tackled in a few months?
• Do the equipment, data or software needed already exist in the team?
• Who supervises day to day: a researcher, an engineer, a doctoral student?
• What will happen to the results: team meeting, report, paper, patent?

A very ambitious topic is tempting, but a reasonable one often yields a usable result and a solid dissertation.

Finding a laboratory and a team

Offers appear on the websites of laboratories, universities, doctoral schools and research bodies. Many units publish a page for internships or jobs; others prefer direct contact. Master's teachers know the teams that regularly host students and can put a candidate forward.

For a speculative application, write to the team leader in a few lines: your course, relevant modules, projects you have already done, the period you want and the link with the team's theme. Attach a CV and your transcripts. Avoid the generic message sent to twenty laboratories: it gets noticed and rarely receives a reply. A phone or video call lets you check that the topic is really available.

Supervision and life in the team

The intern is generally followed by a supervisor, who may delegate day-to-day guidance to a doctoral student or a research engineer. This takes the form of weekly meetings, team meetings and seminars where you present your progress. Taking part in these moments helps you see how a result is discussed, challenged and then consolidated.

It is normal to spend time reading the literature, learning a technique, and preparing reagents or datasets. The first weeks are often less spectacular than expected. Ask precise questions, write down the answers and offer solutions rather than simply pointing out blockages.

Agreement, length and stipend

A three-way internship agreement is signed before arrival by the student, the institution and the host body, which is the laboratory or its managing parent organisation. It sets out the topic, the dates, the places, the terms of access to equipment and the supervisor's name. With the same organisation, the length does not exceed six months per academic year in France.

Beyond two months of attendance, meaning 44 days or 309 hours, a stipend is compulsory in France, with a minimum of 4.50 euros per hour under the rules in force in 2026. In public research it generally follows this regulatory framework; still, ask the team who pays it, because some units depend on several parent bodies and the payment schedule can vary. For an internship abroad, local rules and the host agreement come on top.

The lab notebook and traceability

The laboratory notebook, on paper or digital, is the central tool. Each entry contains the date, the aim of the trial, the protocol followed, the references of products or files, the real conditions, the raw results and your observations. For an internship in computing or modelling, the equivalent is a calculation log linked to a history of code versions.

This discipline lets you find out why a procedure was changed, repeat an experiment and answer an examiner who asks how a graph was obtained. It also protects the team: the data remain usable after the intern has left. Record failures as carefully as successes, because they explain the choices of method.

Safety, ethics and data

Before any handling, the team presents the safety instructions: protective equipment, chemical or biological products, waste, risky instruments. Training or authorisation may be required for certain instruments. Never handle alone anything that has not been explained to you, even if the schedule is tight.

Confidentiality covers unpublished results, data from partners and, depending on the field, personal or health data. Ask what can be quoted in the report, where files should be stored and whether a confidentiality agreement applies. The rules of scientific integrity require that you invent nothing, cite your sources and acknowledge everyone's contribution.

An illustration: a master's in biology

Imagine a second-year master's student in cell biology on a five-month internship. The figures are purely indicative. She joins a team studying how cells respond to a given stress.

1. Month 1: reading papers, training in culture techniques and image processing, defining two conditions to compare.
2. Months 2 and 3: three series of experiments, with controls, and first statistical analyses.
3. Month 4: one experiment cannot be reproduced; she identifies a variation between batches of reagent and repeats the trial.
4. Month 5: synthesis, figures, dissertation and defence, with a section devoted to the limits.

The final result may be modest, but the approach is complete: hypothesis, method, control, discussion. That is exactly what the panel assesses.

Report, defence and possible next steps

The dissertation follows the structure of a scientific paper: introduction, materials and methods, results, discussion, conclusion. Figures must be readable on their own, with a legend and units. The abstract states the question, the method and the main result in a few lines. For the oral, the presentation often lasts fifteen to twenty minutes; prepare for questions about methodological choices and limits.

After the internship, several routes exist: a doctorate, further study in engineering, research and development in industry, teaching, or scientific information careers. A doctorate depends on funding, admission and a project, and is never secured by an internship alone. Ask the team leader for an honest view of your strengths, then explore the other routes as well.