Question1:
1) benefits : Email is immediate: it gives virtually instantaneous access to others; It is global: people can be reached all over the world; It is comparatively cheap; It allows a variety of messages (including sound and image) to be sent. drawbacks : Less time for reflection, because email access is immediate; The risk of sending mail to the wrong persons is high, because it gives access to a large number of recipients; Email appears to invite short informal communication which is not always suitable for all messages; Short, hastily-written mail messages carry relatively little information on mood, so they are easily misunderstood.
2)
a) Programmers need to instruct computers how to solve the problem given a variety of inputs.
b) Users need to give computers the inputs to a particular problem.
c) Computers need to communicate the solution (or lack of one) back to users.
d) For tasks or problems which require more than one computer, the computers need to communicate with each other to share the problem. 3)
- The form of the representation must be perceivable in some way; - The relationship between form and content is shared by all parties involved in the communication process.

4)
a) Representations are context (environment) sensitive because the form of representations can be associated with different meanings depending on the context.
b) Representations are ambiguous when the form of the representation can be associated with more than one