ReproducibiliTea –  Timothy Errington on the challenges in the Reproducibility project: Cancer Biology

In 2013 a group of researchers started the Reproducibility Project: Cancer biology, with the ambition to replicate a total of 193 experiments from 53 high-impact papers. After seven years, because of a multitude of obstacles they encountered, they were only able to repeat 50 experiments from 23 papers. In our next session one of these researchers will be our guest. Timothy Errington will discuss with us the (un)foreseen challenges in this major project and we are honored to have him. We will be talking about things that are at the core of reproducibility, so don’t miss out!

Suggested reading: Reproducibility in Cancer Biology: Challenges for assessing replicability in preclinical cancer biology | eLife (

When: Monday February 14, 2 – 3 PM (CET)
Where: online

2022 01 31 ReproducibiliTea – the University of Groningen Open Science Program

Dear all,

You are warmly invited to next week’s ReproducibiliTea meeting. We are happy to welcome Vera Heininga as our guest speaker!

Vera  is program leader of the UG-wide Open Science Program, which kicked off in September 2021.The aim of this two-year program is to stimulate and integrate Open Science into the research and education culture of the University of Groningen. The program has five pillars: Open Access, FAIR Data and Software, Open Education and Public Engagement and Communication. Vera will introduce the program, and as always in our ReproTea meetings, there will be ample time for questions and discussion.

What: Vera Heijninga on the University of Groningen Open Science Program
When: Monday January 31, 2 – 3 PM (CET)
Where:  Online, contact or @GroningenTea for the link

Suggested reading / background:

Hope to see you on the 31rst!
best wishes, Michiel & Ineke 

ReproducibiliTEA is back

ReproducibiliTEA will be back on Monday Sep 20th. For this first session of the new academic year, we are inviting all of you to brainstorm with us about the new topics for the upcoming sessions.

First, we are interested in what Open Science is for you. You are our main target population and we would like to gain more insight into your understanding and ideas of Open Science to better target our sessions to your needs. Second, we would like to brainstorm about themes for next sessions. What have you learned so far? What do you want to learn more about? Are there topics you need help with, you want to discuss with colleagues. Aspects you would like to evaluate more critically?

Everyone is welcome to join the discussion, from newcomers to old hands. It is possible to attend on campus (max 15 people). But you can attend online as well. More info here:

Upcoming schedule:

DateTimeLocationTopicCheck it out
Sept 2014.00-15.00(CET)Sign up for attendance or meet online. More info here: ReproTea (brainstorm about new themes for 2021-2022)
October 4th14.00-15.00(CET)Sign up for attendance or meet online. More info here: calculations
October 18th14.00-15.00(CET)Sign up for attendance or meet online. More info here: about pregistration and registered reports 

Upcoming ReproducibiliTea meetings

DateTimeLocationTopicCheck it out
May 20, 202114:00 policies and open science: Special guests: Rafaele Huntjens, Kai EpstudeKai’s editorial:;
Rafaële’s editorial:;
Nudging Open Science paper:
June 3, 202111:00 Serge Horbachh: Building a Myth or The importance of proper referencing
June 17, 202114:00 role of academic libraries in nudging open science – special guest: Giulia TrentacostiNudging Open Science paper:

ReproducibiliTea February 11th 11:00 – 12:00: Reflexivity as an Open Science Tool?

We will be tackling the question of how to use reflexivity in our research process, and how reflexivity could aid open science practices.  

Reflexivity is the process by which the researcher continually and explicitly engages in self-awareness and analysis of personal influences on the research process. Reflexivity on the part of the researcher allows them to question and adapt their interpretations, based on issues that arise during the study” (p.5 Field & Derksen, 2020). Practicing reflexivity throughout the research process, could help to produce an honest and critical account of the research process and potentially increase the quality of your interpretations and conclusions. 

Do you agree? And if yes, how to get started practicing reflexivity? How could it help in your personal journey towards more open science? Let’s discuss next week. 

For a bit of thought stimulating background, please read “Experimenter as automaton; experimenter as human: exploring the position of the researcher in scientific research ( from Sarahanne M. Field and Maarten Derksen. 

Date/time: Thursday February 11, 2021 from 11:00 – 12:00

ReproducibiliTea: Does open science make you leave academia? (14.00 – 15.00, 28-1-2021!)

Does Open Science make you leave academia?, While open science practices can have many benefits, there are also downsides. Besides time investments and limited resources, learning about why open science is important can make you unsure of current research practices and (overly) sceptical of existing literature. Ultimately, promising researchers can become disheartened by the status quo, and decide to leave academia altogether. In our session we’ll discuss these issues and how to deal with them. We’ll add a personal touch, so come join us and share your thoughts!
As intro/background reading please have a look at Reflections on my PhD and building sustainable science | by Chris Hartgerink | Medium

ReproducibiliTea January 14, 11-12.00: What would you do to improve open science?

Dear all,

We hope that you all had a good start of the new year! Below are three announcements from your favorite Tea brewers:

To begin with, the next ReproducibiliTea meeting is on January 14, 2021 (yes, that’s in 3 days already!). We ‘d like to have a discussion about how to improve Open Science. If you had money (say, 50.000 euros), what would you do with it to enhance (Open) Science in general? The topic is inspired by the recent launch of a new NWO funding instrument ( We’ll have a brainstorm on big ideas (what would you do with 50.000 euros?) and while we’re at it, address smaller goals as well. What are your Open Science goals for 2021? Keep on reading!

23 January 2019: ReproducibiliTea #19: How to code like a pro – Workshop Henk van der Veen

Preparation: follow these steps, (approx. 15 min): & bring your laptop!

Thursday, January 23rd, 10.00 – 11.00.
Location: UMCG, Triadebuilding entrance 24, room k1.25

More and more, researchers are required to share code and enable others to reproduce their results. However, most of us have received little (if any) training on how to code properly, effectively and efficiently, deal with version control, or encounter reproducibility issues due to updating R-packages. On top of that, it can be really scary to share your code, warts and all, even if you think you’ve done a good job. Luckily there are various tools and software to help.

In this workshop, Henk van der Veen, senior software engineer at Roqua, will give an overview how to create and share code in a way that let’s other people (including future you) easily contribute to or reproduce your results. The focus will be on the packrat package in R and github repositories, as two steps in the coding chain. Henk will discuss advantages of a code repository, and explain about branches, pull requests, coding style and code reviews. Bring your laptop to play around with these technologies, and if there is enough time we might do a coding exercise.
IMPORTANT: To make sure we don’t spend 20 minutes on installing everything in the beginning, if you plan to bring your laptop and try the software, please follow these steps before the session (approx. 15 min): If you run into trouble/have any questions contact me (Daan) or Henk.


Daan Orneé

ReproducibiliTea Groningen BLOGPOST #1: Science; why the best is not yet good enough

Science; why the best is not yet good enough.

Science is currently our best way of acquiring knowledge. It is the continuing process that has brought us – amongst others – our understanding that the Earth revolves around the Sun, the Industrial Revolution, and modern Medicine, while surely in a few years, it will also bring us hoverboards. Continue reading “ReproducibiliTea Groningen BLOGPOST #1: Science; why the best is not yet good enough”