Usability or Accessibility

Overview

I am writing some UX Guidelines for our organization which is a Software as a Service business. Our organization relies heavily on Presentations, Marking Material, as well as our Software.

I don't want the documentation to be web specific, instead it would cite best practices of User Experience using different mediums as examples.

The problem

I am struggling to understand how to categorize the following situations I would like to use as examples for UX considerations.

Example A:

Consider how your users will access your product. A marketing bi-fold will be distributed at various locations that will sit them a shelf that may have a ledge in front of it. This ledge would be used to ensure the brochures don't fall off. As such consider what designs will be blocked by this shelf and ensure this is not an enticing proposition to pick up the brochure.

^ In this example we are discussing how to user will access your product but online examples of accessibility seem to discuss physical limitations considerations of the person not the situation.

Example B:

When inviting external colleagues or clients to call into meetings, consider that the user may not know its is a long distance phone number or not until the moment they try to call in. if this was a long distance number it would create for frustrating experiences for your users which may drive to not be present in the meeting or make they may feel your not detail oriented or inconsiderate. A potential client should not have to pay to meet with us.

The Question

Are these above examples consider a usability or accessibility issue?