• Usability: how useable software is in relation to its intended purpose; usability testing involves a target group of users who are often asked to perform a series of tasks under controlled conditions
• Accessibility: how easy it is for users with disabilities to make full use of software that has been developed; examples include voice recognition and text to speech software; read out alt attribute on image tags on websites

Thank you to C O’Toole & A Madill from Braidhurst High School for allowing me to edit and publish this here.