Analyze...

Activities of the workplace:
   What goals do individuals or groups pursue?
   What tasks do they perform?
   What actions do they carry out.

Artefacts of the workplace:
   What information is retrieved or created in these work activities?
   What tools are being used?

Social context of the workplace:
   How are individuals and groups organized into larger structures?
   What roles are defined (implicitly or explicitly)?
   How do people depend on each other in achieving their goals?

Involve all stakeholders (users, customers, management, owners...)

Early prototyping helps in the requirements analysis phase.