Working Group 1
Quality Assessment and Reproducibility for Instruments & Images in Light Microscopy
The Consortium for Quality Assessment and Reproducibility for Instruments and Images in Light Microscopy (QUAREP-LiMi), formed by the global community of practitioners, researchers, developers, service providers, funders, publishers, policy makers and industry related to the use of light microscopy, is committed to democratizing access to quantitative and reproducible light microscopy and the data generated by it.
Our mission is to provide a comprehensive set of community-agreed guidelines, protocols, automation procedures and other resources aimed at improving quality control, quality assurance, and instrument/method calibration. The stakeholders advocate for the use of the highest level of reproducibility for data generated by light microscopy methods in scientific research and biotechnology applications. In support of achieving its mission, QUAREP-LiMi:
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sanctions Working Groups to form teams that focus on specific technical or outreach topics;
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maintains, disseminates, and teaches best practices, protocols, and software tools; and
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collaborates with providers of reference materials or instrumentation or other tools that enable the easy implementation of best practices at the community level.
We came together in our first online Web meeting on the 28th of April, 2020, with about 50 attendees. By now (24st of April 2024), the network has grown to 620 people from 41 countries worldwide. We have members from academia (research labs, core facilities), national microscopy communities, companies involved in the microscopy business, organizations or institutions related to standardization on a national or international level, and scientific publishers and observers from funding agencies (see the graph below and on the member page for an overview).
Ten working groups (WGs) were established in the 2nd General Meeting on the 9th of July 2020 to bring our common aims quickly forward. Our web page gives an overview of QUAREP-LiMi’s work. In the 3rd General Meeting, WG 11 “Microscopy Publication Standards” and later WGs 12 “Image Visualization and Analysis” and 13 “Phototoxicity” were established. WG 14 “Environment” and 15 “FLIM” are in the process of being established, and WG 8 is restructured to work on “Education, Training and Outreach”.
QUAREP-LiMi operates a NextCloud and an OMERO server, serving as a centralized repository and exchange point for our collective work. These platforms facilitate collaboration and data sharing among our members.
QUAREP-LiMi is absolutely open to new members, and we are looking forward to your contribution. If you are interested in joining our initiative, please fill out our membership form. Use our form for changing your working group (WG) or joining a new WG. For any further questions, please contact us.
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Working Group 2
12th meeting, 11th of October 2021
Meeting summary
One of the main topics of our meeting was to prepare for the joint meeting with WG7 on establishing standardized vocabulary for describing cameras. The idea for this meeting is to bring together camera manufacturers, microscope companies, and users to agree upon the vocabulary.
In addition, we have to test and finalize both, our measurement and the analysis protocols, by generating more data for determination of the photo-conversion factor (PCF) and background. For that we agreed to use a de-focused Chroma slide edge as main test sample for now.
Last, we discussed how to get more members actively involved and keep the active ones motivated.
11th meeting, 13th of September 2021
Meeting summary
This was the first meeting after the summer break. Therefore we mainly did a status update of the current standing of WG2 and our 4 subgroups (area detector, point detector, analysis, test samples). Mainly, first data sets were collected using the first versions of our measurement protocols. Also, we have a first version of a stand-alone analysis program for retrieving of the photon-conversion factor and dark noise contribution. We discussed the documentation and organization of the data and meta data collected, how to improve it, and how to interact with the MetaDataApp.
Working Group 3
Working Group 4
37th meeting, 21st of May 2024
Meeting date
21/05/2024 @ 5:00 PM (CET/CEST)
Meeting summary
WG4 acknowledges the acceptance of the QUAREP by-laws. Judith Lacoste serves as the WG4 Steering Committee (SC) representative, Ileana Micu as the Editorial Review Board (ERB) representative, and Christian Kukat as the Ombuds Board (OB) representative. Also, Maria Azevedo is now co-chair with Aurélien Dauphin. An overarching publication involving WG03, WG04, WG05, and a microscope manufacturer was discussed, and suggestions for WG04 representatives to participate were put forward. An update on the naming convention was provided, and the group discussed what should be included for WG04 datasets. Importantly, WG04 will not meet in June; however, an email containing updates on the naming convention and instructions to test OMERO will be sent. The next WG04 meeting is scheduled for July 16th.
36th meeting, 24th of April 2024
Meeting date
24/04/2024 @ 5:00 PM (CET/CEST)
Meeting summary
A microscope manufacturer is using the QUAREP protocols to provide time-0 measurments before shipping units to its customers. The manufacturer‘s team presented on what seems to be a code implementation issue for the calculation of the reference surface used to calculate the co-registration performance with the tool MetroloJ QC. With the supporting references, they show that the way code is currently written, the 3D reference surface is rendered as a peanut shape instead of an ovoid elongated sphere. As a result of this, the XY and Z co-registration accuracy is not correctly assessed. The authors of MetroloJ_QC will be contacted to present them these findings and ask for feedbacks.
35th meeting, 19th of March 2024
Meeting date
19/03/2024 @ 5:00 PM (CET/CEST)
Meeting summary
WG04 pursues the analyses of 1um beads datasets for color co-registration, comparing different software. There was a discussion regarding measurements of signal to background ratio on aging bead preparations. The group discussed about how detectors settings and metadata can have an impact on the co-registration analysis results. Please note the next WG04 monthly meeting date. It was moved because of QUAREP annual meeting. Lastly, many thanks to the members who agreed to become co-chairs and representatives of WG-04: Maria Azevedo, Aurélien Dauphin, Christian Kukat, Judith Lacoste and Ileana Micu.
34th meeting, 20th of February 2024
Meeting date
20/02/2024 @ 5:00 PM (CET/CEST)
Meeting summary
Today the proposed QUAREP by-laws were presented. WG04 is grateful to those who worked with David Grunwald for the preparation of this impressive document. The by-laws will be submitted for approval during the QUAREP annual meeting next April. In the mean time, WG04 is asking its members to come forward for the following positions in our workgroup: WG04 co-chairs, a WG04 steering committee representative, a WG04 editorial review board representative and a WG04 ombuds board representative. In addition, QUAREP will need to elect 13 persons on the steering committee and 3 persons on the ombuds board. Our organisation just reached 600 members, for sure there will be new people joining on the above committees to make QUAREP better. Please let us know of your interest in the above positions. A big thanks in advance!
Working Group 5
62st meeting, 9th of July 2026
Meeting date
09/07/2026 @ 3:30 PM (CET/CEST)
Meeting summary
Meeting covered volunteers for elected posts, ELMI feedback, OMERO upload catch up and data collected so far to determine best bead size for ISM based systems. Lastly, a presentation from an intern at the French metrology group detailing software development for identifying aberrant PSFs.
Working Group 6
Working Group 7
40th meeting, 9th of March 2026
Meeting date
09/03/2026 @ 5:00 PM (CET/CEST)
Meeting summary
Topics:
1) WG7 Participation in the ELMI Meeting
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It was agreed that WG7 will submit an abstract for a community workshop at ELMI, focused on the LiMi-Model.
Also, it was decided that WG7 will support WG2 on a workshop or poster about the LiMi-Model_Camera revision process and outcome.
2) Discussion on the LiMi-Model website and LiMi-Model Viewer
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Participants were requested to provide feedback on the following three topics (please find details in the minutes document):
1) The LiMi-Model Viewer functionality
2) The LiMi-Model Viewer legend
3) The BP document
3) Content of the ELMI LiMi-Model Workshop
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This workshop will serve as the first major outreach effort for the LiMi-Model, covering its purpose, governance structure, and the ways in which community members can engage and contribute.
To provide a broader context, the workshop will open with an introductory presentation situating the LiMi-Model within the wider landscape of community metadata initiatives, including REMBI, imaging modality ontologies (such as FBbi and EDAM), and Next Generation Metadata schema definition languages. This aims to bring greater clarity to the range of ongoing efforts in the field.
The workshop will cover the following topics:
– Presentation of the LiMi-Model website
– Presentation of the model visualisation (prepared by Antony)
– Overview of model governance and contribution pathways
39th meeting, 19th of January 2026
Meeting date
19/01/2026 @ 5:00 AM (CET/CEST)
Meeting summary
WG7 met to kick off 2026 with introductions, including a few new faces, and a round where everyone shared their wishes for the year ahead. The group caught up on ongoing work around light microscopy metadata, including LiMi-Model, REMBI alignment, and links to efforts beyond bioimaging. We discussed updates on repositories, community coordination, and the fact that several new full-time positions have now been funded to work specifically on metadata extensibility. Looking ahead, the group plans a future presentation on the Czech national strategy for metadata, and agreed on a handful of practical next steps to keep the different efforts better aligned.
38th meeting, 17th of November 2025
Meeting date
03/11/2025 @ 5:00 PM (CET/CEST)
Meeting summary
The following decisions were made regarding the revision of the QC/Performance Extension of the NBO-Q (aka LiMi Model)
DECISION 1: “QC/QC Run” shall be fused with “QC/QA assay”
DECISION 2: DateTime and ProtocolUsed fields will be added to both Sample and Experiment
NEXT STEP: CONSENSUS: invite people from QUAREP WG12 and BINA Informatics WG to present about the current state of the art. Ask them to provide a representative who will be available to present at our next meeting.
37th meeting, 15th of September 2025
Meeting date
15/09/2025 @ 5:00 PM (CET/CEST)
Meeting summary
Discussion about the new name for the NBO-Q model: WG7 will present the three finalist names to the SC and present the pros and cons of each of the three names. At the same time, a vote was held to determine the preferred name of WG7.
2) Update on the status of the NBO-Q webpage: Anthony presented progress towards an interactive viewer of the NBO-Q to be used for the website.
3) REMBI-DCAT-AP presentation: Marek Cebecauer presented work performed by the Czech Core Metadata Model (CCMM) initiative to build a DCAT-based REMBI schema.
4) Announcement of the successful funding of the Imaging-Persistent Hardware Descriptor (PHD) project to assign persistent identifiers to individual microscopes and their hardware descriptors.
36h meeting, 16th of June 2025
Meeting date
16/06/2025 @ 5:00 PM (CET/CEST)
Meeting summary
We had an extended conversation about the naming of the NBO-Q model, eliminating some of the previous suggestions and adding a few new which will be sent out to WG7 again for further voting. We also looked at the status of the website update and reported on discussions from ELMI.
35th meeting, 5th of May 2025
Meeting date
05/05/2025 @ 5:00 PM (CET/CEST)
Meeting summary
Worked on aligning attributes from the “MetricDataset”, “MetricsOutput” and “KeyMeasurements” classes of microscopemetrics-schema
with NBO-Q
NEXT STEPS:
Discuss with Julio ML about the mapping and questions that were put forth during this meeting
Working Group 8
14th meeting, 23rd of April 2025
Meeting date
23/04/2025 @ 4:00 PM (CET/CEST)
Meeting summary
Summary (topics discussed): Presented and discussed objectives and survey, provided feedback from GerBI, who saw the survey. Sylvia and Gaby showed the latest changes made to the survey. Asked for more contributions (links were shared again). Angela suggested also we have someone more expert on surveys go through the questions (especially making it quantifiable through better structured Likert scales?).
Once this is sorted the Gaby sends a preview of the survey to all QUAREP for final feedback, on the spirit of opening to all community before going public with results.
We ten plan for a date for releasing if and when there is consensus.
Ask also to vote on whether we can/should ask for email (as optional, never mandatory!).
Working Group 9
Working Group 10
34th meeting, 10th of December 2024
Meeting date
10/12/2024 @ 4:00 PM (CET/CEST)
Meeting summary
Presentation by Siân Culley (King’s College London): be there!
30th meeting, 12th of March 2024
Meeting date
12/03/2024 @ 4:00 PM (CET/CEST)
Meeting summary
This meeting will be dedicated to a quick review of the RID parameter, a global discussion about the new parameter AS told us about and importantly, the ByLaws document with the need of volunteer candidates for the various positions (SC, EBR, OB).
Working Group 11
46th meeting, 03rd March 2026
Meeting date
05/03/2026 @ 11:03 AM (CET/CEST)
Meeting summary
Decide on next chair (Chloe’s torch bearer)
Ayse: Discuss her idea of IA she is working on
Define what depends on application means.
QUAREP-endorsed MicCheck?
Review the modalities we already discussed to ensure we are still ok with them.