Why is it useful to have a complete WBS before engaging in formal uncertainty assessment? Use an example of your own creation to support your explanation. 2. Explain the relationships among project deliverables, work packages, and milestones as they would appear in a schedule. Support your explanation with examples. 3. Why is it useful to consider both unfavorable risks and favorable uncertainties as part of the project planning process? Describe an example from your own work or personal life in which an unfavorable risk interfered with your ability to execute a project as you had initially envisioned it. Describe another example, also from your own work or personal life, in which an unexpected positive uncertainty caused a project to turn out better than you had envisioned it. 4. VisitHistorylink(Links to an external site.)and search for links to Web pages describing the sinking of the Lake Washington Floating Bridge on November 25, 1990. Search words: "November 25, 1990." Read several of these descriptions. A brief description from Historylink is as follows:

On November 25, 1990, after a week of high winds and rain, the 50-year old Lacey V. Murrow Bridge (Lake Washington Floating Bridge) breaks apart and plunges into the mud beneath Lake Washington. Since it took some time for the bridge to sag and finally crack apart, news cameras were poised and ready to show post-Thanksgiving TV viewers a once-in-a-lifetime telecast of the demise of the historic I-90 span. It is later discovered that hatchways into the concrete pontoon air pockets were left open, allowing water to enter, while the bridge was undergoing a $35.6 million renovation. a. What tools could the team have used to uncover the possibility of water entering the pontoons? Name at least three and explain how they would be applied. b. Identify and discuss at least one positive outcome that could have emerged from this project crisis. 5. Below is some information about a project to implement a new manufacturing cell to assemble personal digital assistant devices. Note: this exercise is about the logical flow of the project's tasks. Map out the project's work using activity on arrow for success.

Task	Duration Estimates	Immediate Predecessors
A. Determine process requirements	2 weeks	None
B. Benchmark competitor's processes	4 weeks	A
C. Prepare benchmark report	1 week	B
D. Design process and layout (preliminary)	2 weeks	A
E. Finalize design and set up manufacturing cell	2 weeks	C & D
F. Select and train operators	1 week	D
G. Pilot test new process	2 weeks	E & F
H. Finalize process design	1 week	G

Questions: a. Draw an activity-on-node (AON) network b. Identify the ES, EF, LS, LF, critical path, total float and free float using the critical path algorithm. c. Which of these tasks should the project manager track most closely? d. Where do you see potential errors in network logic? Explain your reasoning.