These questions will guide you to understand the context.
1. I want my web/mobile application to serve the following audience:
Students
Field Engineers
Architects
Farmers
Designers
Teachers
Doctors
Other
2. I want my web/mobile application to serve the following groups of people:
People with visual impairments (blindness, low vision, color blindness) who may need to navigate the website with a screen reader
People with hearing impairments (deafness, low hearing) who may not be able to hear audio content
People with cognitive impairments (learning disabilities, poor memory) who may have difficulty understanding the structure of the website or remembering how to complete a task
People with physical impairments (paralysis, arthritis, tremor) who may have difficulty using a mouse
People with physical impairments (paralysis, arthritis, tremor) who may have difficulty using both mouse and keyboard/stylus
People with dial-up or slow internet connections
3. I want my web/mobile application to serve the following age groups:
0-15
15-25
25-35
35-45
45-60
60-75
Above 75
4. I want my web/mobile application to serve users who speak/read:
English
Spanish
French
Other
5. I want my web/mobile application to serve users with:
a very low level of experience using web applications
a moderate level of experience using web applications
a high level of experience using web applications
6. I want my web/mobile application to include the following types of content:
Text
Images
Audio
Video
7. I want my web/mobile application to be accessible on the following platforms:
Desktop/laptop computer
Phone (iOS, Windows, Android etc)
Tablet (Windows, iOS, Android etc)
Phablet (Windows, iOS, Android etc)
8. Which Assistive technologies your web application should be compatible with:
Screen Readers
Screen Magnifiers
Keyboard Only
Speech Recognition Software
Text-to-Speech