HCI and UI - Discussion

> Explain the differences between various kinds of direct manipulation with respect to translational distances.

> Then, consider when and under what circumstances you would choose to use voice activated personal assistants, such as Siri, Cortana, and Google Talk, versus choosing to avoid it.

> Describe what roles voice/speech activated interactions/interfaces play in UI/UX, identifying at least 3 benefits and 3 limitations.

Need 2-3 pages with peer-reviewed citations. No introduction or conclusion needed.