diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 # Wonderful Wednesdays
 
-**June 12th, 2024**. 
+**July 10th, 2024**. 
 
-The challenge for the next webinar is about platform trial designs. Details can be found [here](https://github.com/VIS-SIG/Wonderful-Wednesdays/tree/master/data/2024/2024-06-12).
+The challenge for the next webinar is about responder definition derivation. Details can be found [here](https://github.com/VIS-SIG/Wonderful-Wednesdays/tree/master/data/2024/2024-07-10).
 
 For more on PSI and wonderful wednesdays see https://www.psiweb.org/sigs-special-interest-groups/visualisation/welcome-to-wonderful-wednesdays
 
@@ -20,15 +20,15 @@ You will be able to submit your improvements for feedback via a google form on t
 We will make the submissions available to the community together with highlights of the strength and limitations through our [blog](https://vis-sig.github.io/blog/). Over time, this will lead to a gallery of visualizations for others to learn from.
 
 
-## May data set
+## July data set
 
-**Upcoming July 10th, 2024 webinar**. The current data example focuses on [platform trial designs](https://github.com/VIS-SIG/Wonderful-Wednesdays/tree/master/data/2024/2024-06-12).
+**Upcoming August 14th, 2024 webinar**. The current data example focuses on [responder definition derivation](https://github.com/VIS-SIG/Wonderful-Wednesdays/tree/master/data/2024/2024-07-10).
 
 Submit your visualisations [here](https://docs.google.com/forms/d/e/1FAIpQLSdNAaiuUAD89LAdQm5KNnLWs-MjqA4pzX2VHAwN7iqwoKpi-Q/viewform) or send them to <info@wonderfulwednesday.org>!
 
 ## Next Webinar
 
-**July 12th, 2024**.
+**August 14th, 2024**.
 
 ## Previous data sets 
 
@@ -126,6 +126,8 @@ Submit your visualisations [here](https://docs.google.com/forms/d/e/1FAIpQLSdNAa
 
 * [platform trial designs](https://github.com/VIS-SIG/Wonderful-Wednesdays/tree/master/data/2024/2024-05-08)
 
+* [platform trial designs](https://github.com/VIS-SIG/Wonderful-Wednesdays/tree/master/data/2024/2024-06-12)
+
 
 ## Downloading single files
 
diff --git a/data/2024/2024-07-10/Readme.md b/data/2024/2024-07-10/Readme.md
new file mode 100644
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+# Responder definition
+
+## Background
+
+- When a new patient-reported outcome (PRO) is developed, there is interest in deriving the following, to support interpretation of data collected using the new tool:
+  - Minimal Clinically Important Difference (MCID) / Responder Definition (RD)
+  - Meaningful Between-Group Difference
+  - Meaningful Score Categories
+- These are usually derived by using an existing, validated measure as the ‘gold standard’ to quantify e.g. disease status
+
+
+## Data
+
+- Simulated dataset: 1000 subjects, 2 timepoints (Baseline, Week 16)
+- Treatment allocation is not important and not provided
+- At each time point, data is provided for two tools:
+  - PGIS – the “gold standard” – graded on a 4-point scale (‘None’, ‘Mild’, ‘Moderate’, ‘Severe’)
+  - ‘NEWTOOL’ – the new measure, scored on an 11-point numeric rating scale from 0 to 10
+
+## Challenge
+
+Use visualisations to support in the derivation in any or all of the following:
+
+- MCID
+- Meaningful between-group difference
+- Meaningful score categories
\ No newline at end of file
diff --git a/data/Readme.md b/data/Readme.md
index 999f5b9..f5a901d 100644
--- a/data/Readme.md
+++ b/data/Readme.md
@@ -115,6 +115,8 @@ Table of contents for the 2023 webinar series data sets:
   - [Platform trial designs](https://github.com/VIS-SIG/Wonderful-Wednesdays/tree/master/data/2024/2024-05-08). Presented on **May 8th, 2024**.
   
   - [Platform trial designs](https://github.com/VIS-SIG/Wonderful-Wednesdays/tree/master/data/2024/2024-06-12). Presented on **June 12th, 2024**.
+  
+  - [responder definition derivation](https://github.com/VIS-SIG/Wonderful-Wednesdays/tree/master/data/2024/2024-07-10).
 
 **NOTE** to download a single data set as a csv file, click on the raw
 button and save the file. The [following link describes the process in