Internal and External Consistency

Internal consistency 

Refers to an application or family of related products, using a consistent approach in their design/user experience.  This allows users to be able to interact with the product/s quickly, predictably and efficiently.  

• Call to action buttons being a particular colour.  

• Shopping cart in the same location. 

• Layers palette always in the same location by default.

External Consistency 

Refers to consistency across unrelated products.  

• Control C/V works across most applications.  

• File/Edit menu's used.

• Logo at that top left hand corner of the website and links to the homepage.

Accessibility

Usability is about making products easy to use. Accessibility focuses on designing products so that people with disabilities can use them, making sure there are no barriers preventing equal access (https://www.w3.org/WAI/EO/Drafts/access-use/accessibility-n-usability2010-09Sep-09.html). 

When designing an outcome, some areas you should take in account are:

• Eyesight issues

• Colour blindness

• Quality of user hardware, software, internet connection

• Language and culture of users

• https://www.csfieldguide.org.nz/en/chapters/human-computer-interaction/accessibility/

Websites have their own accessibility guidelines (https://en.wikipedia.org/wiki/Web_Content_Accessibility_Guidelines), such as

• Use of 'alt' tags

• Avoiding flashing images

• Time-based media

  • • videos - have captions and ensure they are in sync

    • Audio - have transcript

• Ensure that the removal of page styling will not impact intended information and structure

• Include a meaningful navigation

• Readable text content

• Logical page structure

• Useful Error messages