This page contains the following information for the Post 16 Data Collection return for Autumn 2026:
- Important Dates
- Known Issues
- Resolved Issues
- Read Welsh Government Guidance
- Read Bromcom Guidance
- Book onto a Live Webinar
- Watch Live Webinar Recordings
Access: The permissions required to run and troubleshoot the Post 16 return are found in the Census Module of Config>Setup>Roles and Permissions. Each tick box on the right determines which functions are visible/available on the page for users with the selected Role.
See also: How to get started with Roles & Permissions
Important Dates
- Data on Post-16 Pupil Learning Activities is required for the previous academic year (2025/26).
- DEWi opens for Post-16 data submission on Tuesday 15th September 2026.
- Deadline for data submission is Friday 9th October 2026
Known Issues
02.10.2026
14.09.2026 Census Errors 12978 and 12979
The Welsh Government has issued a new validation file that updates errors 12978 and 12979.
Until the updated rules are released in the MIS, these errors may trigger incorrectly. They should not trigger when the return is submitted to DEWi.
The updated rules will be included in a future MIS update.
Resolved Issues
05.10.26
CAS-508619-M3B4C5 – Wales P16 – Year 11 Students Appearing in Post-16 Validation Errors when they should not
Picks up current Y12 Students (Last years Y11) causing Errors 4000, 12372, 12986
Read Welsh Government Guidance
IMPORTANT: It is the school’s responsibility to review the Welsh Government guidance to ensure all required information is submitted as part of the Post 16 Data Collection.
- For Welsh Government documentation and guidance on Post 16 Data Collections, please see here.
Read Bromcom Guidance
Click on the links below for the Bromcom Wales Post 16 Data Collection 2026 guidance.
Post 16 Data Collection 2026 Guide
Post 16 Data Collection 2026 Error Resolutions Guide
Book onto a Live Webinar
Reserve a place on the free Post 16 Data Collection Live Webinars by clicking here.
Webinar Dates:
- Monday 14th September – 1.30pm-3.00pm
- Tuesday 15th September – 9.30am- 11.00am
Watch Live Webinar Recordings
Click the link below to watch a recording of the 2026 Live Webinar. A name and email address will be required to view the recording.