The OER dev open standard catalog

Explore a curated list of standards that are relevant for development of web based educational resources.

Read more

OER Dev principles of universal design and accessibility

The OER dev community adheres to principles of universal design and accessibility and has a strong focus on making all content generally accessible, including for those with print disabilities, for example, blindness or low vision, severe dyslexia or mobility impairment. Web accessibility refers to the inclusive practice of removing barriers that prevent interaction with, or […]

Read more


For audio files on the GDL we use MP3 (ISO 11172-3:1993). High QualitySampling rate = 96 kHzBit depth = 24-bit depth Medium Sampling rate = 48 kHzBit depth = 16-bit depth Low Sampling rate = 44.1 kHzBit depth = 16-bit depth Frequency ranges of different sounds vary, so the requirements for a digital version of […]

Read more

Video compression

Importing video files into the Global Digital Library requires special considerations about the file size of the video resources that will be imported. Below are some general guidelines for importing video files: Use the .mp4 file format Use the H.264 (a.k.a. x264) video codec to ensure video will play in web browsers Use the aac audio codec Use compression Short videos (5-10 […]

Read more