8.12

This assignment is due on Tuesday, April 16 at 11:59pm. Don’t bullshit.

Exercise 1. Read The Therac-25: 30 years later by Leveson. Focus on what to do.
• When you follow the link above with your browser, you should see Leveson’s article, as well as a button “<” in the upper-right corner. Use the “<” button to expand the annotation sidebar.

• You may need to log in to Hypothesis, using the account you created in Reading 1: Who can define the bigger number?.

• **Pay attention to this next step**. This is a common mistake that results in many zeros on the assignment. After logging in, you are not done. You still have to expand the drop-down menu “Public” in the top right sidebar, make sure it says “my groups”, and change it to our course group “211”. You belong to this group because you used the invite link in Reading 1: Who can define the bigger number?. If you don’t post to this group, then other students won’t see your annotations, and you won’t get credit.

Exercise 2. Find a place where Leveson says what to do. Carefully select it, and Annotate it like this:
• In the future, when …

• I will …

Exercise 3. Find one place in the article where you were confused, uncertain, or curious. Carefully select exactly the relevant passage, and Annotate it with your question and what you have done towards answering it.
• Make your question clear, descriptive, and specific.

• Don’t be too brief, terse, or vague. Don’t just say “What’s this” or “I don’t understand”.

• Don’t just summarize.

Your description of what you have done towards answering it must be concrete and specific. It is not enough to say “I did some research” or “I asked around” or “I searched the Web” or “I thought about it”. What queries did you perform? What information sources did you find? Cite them.

Exercise 4. Once you have added your annotations, respond to someone else.

Optional: read more about Therac-25 in Appendix A of Leveson’s book “Safeware: System Safety and Computers”. Here’s one key good part: