Open Matrices Item Bank (OMIB)
================================

Original authors: Marco Koch, Frank M. Spinath, Samuel Greiff and Nicolas Becker.
Reference: Koch, M., Spinath, F. M., Greiff, S., & Becker, N. (2022).
Development and Validation of the Open Matrices Item Bank.
Journal of Intelligence, 10(3), 41. https://doi.org/10.3390/jintelligence10030041

Original public repository: https://osf.io/4km79/
API node: https://api.osf.io/v2/nodes/4km79/
Retrieved: 2026-10-27

The original article explicitly declares free, unlimited access to the item
bank under GPLv3. This declaration concerns the bank, rather than only the
CC BY license of the article. The public OSF node metadata currently has no
separate node_license value, and the original downloaded archives contain
no separate COPYING file. The article is the license evidence retained
in this provenance record. The GNU GPL version 3 text is supplied at
licensing/GPL-3.0.txt.

All six original repository files have been downloaded without alteration.
Their SHA-256 hashes match the original public OSF API metadata saved in
source/osf-files.json. ZIP files were extracted with path traversal checks.
The 220 item SVGs and 20 construction element SVGs in items/ and choices/
are exact copies of original assets, renamed only for stable URLs. Hashes
for the copies are included in the item index.

The derived JSON indexes, Spanish/English labels and pilot instructions
in this folder were prepared for coeficienteintelectual.net on 2026-10-27.
They are supplied under GPLv3 as an adaptation of the OMIB materials.
This website is an independent implementation; no endorsement by the
original authors, their universities or the original publisher is claimed.

item-bank.private.json contains solutions, full item codes and parameters.
It is intended for backend scoring, not direct serving as a public API asset.
Source and license availability must still respect the GPL conditions.
The source originals and their solution spreadsheet remain available in
the documented public original repository and the retained source package.

Psychometric limits
-------------------
The original study administered ten forms of 22 set-specific items plus six
common anchors, preceded by two practice items. It was self-paced and
unproctored. The retained XLSX contains 220 set items but does not contain
the six anchor solutions. The anchor stems are present as SVGs.

The suggested implementation uses published set 1 (22 items), with original
items 19 and 20 from set 10 as unscored practice. This is an adapted pilot,
not an exact replication of the study's 28-item forms. Consequently, the
original reliability coefficient must not be attributed to this pilot.
No IQ conversion, Spanish or English population norms, diagnostic cutoffs
or population percentiles have been supplied or invented.

Scoring follows the original implementation instructions: a response is a
20-bit string. It earns one point only if every selected/unselected element
matches the published solution. Every other response, including an
omission, earns zero points. There is no partial credit.

The Spanish and English website instructions are local editorial adaptations,
not original-author-certified translations. A Spanish/English interface does
not establish cross-cultural validity or representative population norms.

Deployment packaging
---------------------
Serve only the item/choice SVGs and the public indexes needed by the test.
Use the private index on the backend. Do not accidentally expose all source/
and original/ directories simply because they live under assets in this
workspace; choose the public deployment files explicitly. Preserve the
GPL notice and provide the corresponding covered source distribution.

Technical verification performed
--------------------------------
240 deployable SVGs parse as XML. All item viewBoxes are 0 0 320 320; all
construction elements are 0 0 100 100. No script, foreignObject, event handler
or remote/data href was found. Every key and cell code is a valid 20-bit
string; every ninth cell code equals its published solution. The two
practice items are disjoint from the suggested scored form.
