Question: You are to do a case study of an app/site examining the interaction design and usability. Pick a web site that you are not familiar with and go through the process of doing a difficult/advanced and potentially unusual task. For example, if it is a retail sales site/app go through the process of finding an unusual item right through to payment but without actually completing the payment process. Note and examine each step in the process, snipping images along the way. Discuss the steps that went well explaining why they went well. Discuss the steps that you struggled with (often referred to as "pain points") explaining why it was a struggle. Steps going well or being a struggle can be affected by page design as well as the flow/hierarchy. Include annotated images as needed to make your discussion clear.

Redesign the portions of the app/site that you feel need improving. Include wireframes/mock-up images of your improved pages as well as a flow diagram for changes in the flow structure. Discuss the rationale for your changes. You are welcome to take suggestions from similar sites that you feel do a better job but you need to reference them.

Be careful with the site that you chose. If you chose an app/site that is terrible, you are creating an enormous task for redesigning it. If you chose an app/site that you think is perfect you won't have any improvements to make and in essence will wind up with an "incomplete" assignment and a poor grade.

Report

Prepare a professional report discussing your findings and improvements. The report needs to include:

? The name and purpose of the app

? The URL

? The task(s) you performed

? Presentation and analysis of each step in the task process including images annotated as needed, focussing on the pain points.

? Recommended changes, including annotated images, along with a discussion of the rationale for each change.

Marks

Presentation and analysis of the steps in the process 8marks

Presentation and rationale of the improvements 8 marks

Professional appearance including annotated images 4 marks

Submission

A single professional looking report (including screen images and wireframes) in Slate readable format (pdf or Word) is to be submitted to the Slate Dropbox

4.20 Figure P4.20 shows an electropneumatic clutch actuation system for heavy-duty trucks [3]. An electronic control unit (not shown) sends a signal to fully open either the supply or exhaust valve. When the supply valve is open, high-pressure air from the supply tank flows through the valve to the cylinder chamber. When the exhaust valve is open, air flows from the cylinder chamber to the surroundings. The two valves cannot be open at the same time. The constant supply pressure is P and the ambient pressure is P atm . Fully open orifice area is An for both valves. For normal operation the supply pressure is much greater than the chamber pressure P and the chamber pressure is significantly greater than ambient pressure P. Therefore, we can assume that the supply and exhaust valve flows are always choked. Force F, is the reaction force caused by displacing the clutch compression spring when engaging the clutch plates. The chamber volume is V = Vo + A x where V, is the volume when the piston displacement is zero. Derive the complete mathematical model of the electropneumatic system.One important objective of the paper-making process is to maintain uniform consistency of the stock output as it progresses to drying and rolling. A diagram of the thick stock consistency dilution control system is shown in figure (a). Desired cumbency = Run Consistency Pulp To paper mixing making The amount of water added determines the consistency. The block diagram of the system is shown in Figure (b). Let H(s) = 1 and Gp(s) = 3(29+1), Gc's) = K/s+1). Determine; () the closed-loop transfer function To) = Y(sMR(s). (W) the steady-state error for a step change in the desired consistency R(s) = A/s. (Wi) Calculate the value of K required for an allowable steady-state error of 2%