Requirements
Resources/Tools – this is where assistive technology comes in, as well as any other technological infrastructure of a school or district. The presence or absence of these, and then the decisions made surrounding these can significantly support or impede an individual's and the system's performance. Sometimes, the barrier is a lack of resources – you just don't have the tool or device or materials to get the job done. Without a curriculum, you'd be pretty lost – curricula are resources in the environments. Without texts or chemistry sets or calculators, you might have a difficult time teaching students what they're supposed to learn.
Sometimes, the barrier is how resources or tools have been implemented in the system – who does or does not have access, what functions or capabilities have been disabled (usually because of policy, which should have been modified instead of constraining the resources), where it's physically located and what you have to do to get it, and so on.
Reflection:
What resource/tools barriers are in your school or work environment? Is it a lack of resources or tools, or is it a matter of how those resources or tools were implemented? How could things be improved?