Picking the right architecture = Picking the right battles + Managing trade-offs
- Clarify and agree on the scope of the system
- User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?
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On a MacBook Air with 104mm x 76mm touchpad, macOS appears to put its equivalent of upper_thumb_line 20mm from the bottom, and lower_thumb_line 10mm from the bottom. On Magic Trackpad, 130mm x 108mm active area, these seem to be the same (20mm/10mm from bottom).
- Finger: Live touch, no speed threshold, free movement
- Thumb: Live touch, no speed threshold, free movement