All of these elements are required in every use case.  Use cases accumulate scenarios. They define how a user uses a system, what happens when the system succeeds, and what happens when it fails. Each scenario describes a procedure and what happens as each step progresses.  Users are all of the people who will engage in the activities described in the use case.  For example, if you are writing a use case for logging into a software system, the users would be anyone who must log in. Preconditions are those elements that must be in place prior to the start of the use case.  For example, users with permission to use the system have been identified and entered into the system ahead of time, so the system will recognize their usernames and passwords when entered. The basic flow is the procedure the users use to achieve the primary goal of the system and how the system responds to their actions. For example, the user inputs a username and a password, and the system allows the user in. Alternate flows explain less common actions. For example, the user is on a different computer and must answer a security question. Exception flows detail what happens when the user cannot achieve the goal. For example, the user inputs an invalid user name or password. Post conditions are those elements that must be present when the use case is completed. For example, the user can proceed to use the software. Each thing the user does becomes a separate use case. The scope of a use case is narrow. For example, if a company is implementing new software to create purchase orders, you could write several use cases about this. One use case might be about how users log in to the system. Another might be about how to run requisition reports. List all of the functions of the new technology or business process you are analyzing, and write a use case for each one. Outline everything the user does and how the technology or process responds to those actions. In a use case about how users log into a software system, the normal course of events would state that the user enters a username and password. The software responds by verifying the user and either granting or denying access to the system.  Alternate flows and exception flows are written to describe the actions when there are obstacles to the goal. If the user is denied access because the system didn’t recognize her computer, she may be prompted to verify her identity by answering a security question. If the user inputs an invalid username or password, she may be prompted to answer a security question and enter an e-mail address to receive new log in information. Write use cases for all of the other functions of the software or business process. Identify the users for each function, and write the steps for the normal course of events. Explain contingencies for when the goal cannot be achieved. For each step, explain how the system responds to the actions of the user.
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One-sentence summary -- Define the elements of the use case. Define how the user will use the technology or process. Describe the normal course of events for each use case. Repeat the steps for all other functions and users.

Q: You also need to include a section on your evaluation and grading policy. This section of a syllabus tells students how the major components of the class contribute to their final grade.  Many institutions have specific rules about what should be included in this section, so check with the administrator or department for guidelines on what must be included. Include your grading scale. For instance, an A equates to a 90% to 100%, a B equates to an 80% to 89%, and so on and so forth. Explain how assignments will be weighted in order to determine final grades. For instance, exams make up 40% of the total grade, the term paper makes up 30% of the grade, and projects and/or homework make up the remaining 30%. Provide a statement about any other grade policies, such as if you drop the lowest test or quiz grade. You may want to also include a definitive statement on your extra credit policy. If you don’t provide extra credit, state it explicitly. Immediately after the evaluation policy section, you should include a section that details your assignment policy. This will give students an idea of how late, missed, or incomplete assignments will affect them and impact their grade.  Include an explicit statement about makeup exams. Make sure to address your policy about late papers. For example, some teachers or professors like to take a letter grade off per day for papers that are late. If missing a test or not completing an assignment will substantially impact a student’s grade and make it impossible for them to pass, you should mention this here. A course calendar is possibly the most important part of a good syllabus. Your calendar or schedule will outline how where the class will be, content and assignment wise, throughout the semester (or year).  The calendar may provide a daily breakdown of all lecture topics. List written assignments on the day they will be assigned and on the day they are due. List the assignment dates of all readings (from the textbook, other texts, and electronic materials). Course policies may include rules, and behavioral and academic expectations. This section will give your students a good idea of how they need to conduct themselves while in your classroom or while engaging in coursework.  Many colleges and universities have specific policies and statements that must be included in this section of the syllabus, so check with the appropriate educational institution for guidelines. Attendance Policy. Most educational institutions have a school-wide attendance policy which you may want to include in your syllabus. If the course attendance policy differs from that of the university, you should also include this information. Class Participation Policy. Describe exactly how students should participate and what their participation will mean to their grade. Classroom Etiquette. Be sure to spell out the policy on eating and drinking in class, using a cell phone or laptop during class, talking to other students while the instructor is speaking, using an electronic device to record lectures, and proper procedure for arriving late or leaving early.
A: Describe your evaluation and grading policy. Include a late, missed, or incomplete assignment policy. Provide a course schedule. List your classroom or course policies.

Article: They may have recommended a product suitable for cleaning the canvas furniture. A lot of canvas furniture has special waterproofing features which must be considered when using a commercial cleaning product. When selecting a product, check that it doesn't affect any waterproofing placed on the canvas. Some suggested options from a sweep of various online forums include: Barkeeper's Friend, LAs Totally Awesome and Spot Shot Upholstery Stain Remover. However, such products tend to be very strong and may cause new stains. If you do use them, always test a small patch first, to see if the product stains or removes waterproofing properties.
Question: What is a summary of what this article is about?
Check the manufacturer's instructions. Ask for a recommendation at a store that sells canvas furniture.