businesscase怎么写( 二 ) _businesscase

5.如何书写Use Case什么是Use Case用例描述文档的书写是系统分析人员对用户需求的深刻理解的体现。
是后期时序图和实际开发的重要依据。也可以对作为项目估算的依据，以及根据UC复杂度和开发周期来衡量开发人员的工作效率。
因此UC的书写规范及其重要，就工作用的一些经验，比如书写格式、书写内容及其注意事项与大家分享。大纲图：一、前期准备？？对用户的问题要有非常深刻完善的理解？？确保能够解决用户的所有问题？？把用户的需求真正地反应到商业模型？？对以后的设计和开发过程提供说明和框架？？根据需求生成UI界面二、Use Case内容首先有用例名称：一般是模块名称或者模块中功能点的名称。
其次文档变更记录（Revision History），具体内容如下：1、基本描述（Brief Description）描述用例在系统中的作用。比如此用例的使用者是谁、使用者所要做的操作。
2、前置条件（Precodition）描述该用例执行前所要满足的条件。比如用例B执行前，必须先执行A，则用例的前置条件是执行A 。
3、事后保证（PostCodition）此用例执行完毕后的条件4、主要流程（Basic Flows）用户操作该用例的基本流程，是后期时序图的主要参考5、选择性流程（Alternative Flows）在操作主要流程过程中，出现的一些分支流程，是后期时序图的主要参考6、特别需求（Special Requirement）对一些细微功能点进行描述，比如用户身份验证规则、订单号码产生规则、是否需要SSL加密等等7、使用界面（User Interface）美工根据需求制作的UI，及其对UI中栏位进行的说明。
6.business letter 开头的对方的地址怎么写（美式）,请例举,谢谢Brief Introduction to Business LettersWords and expressions:Letterhead ReferenceSalutationComplimentaryAttention lineSubject lineEnclosureCarbon copyFull block style（齐头式）Indented style Section A Parts of Business LettersMost business letters have seven standard parts.They are letterhead, reference and date, inside address, salutation, body, complimentary close, and signature.When appropriate, any of the following optional items can be included.Attention line, subject line, file or account number, enclosures, carbon copy notation, mailing notation and postscript.Letterhead Letterhead designs vary with business organizations and occupy the top of the first page.They may be positioned at the center or at the left margin the top of the page.A business letterhead, usually printed, contains all or some of the following elements:The company's name , address, postcode, telephone number, telex number, fax number, the name of the officer or the director and even some picture or slogan for a symbol of the company.Reference and DateA typewritten date is necessarily included in the heading.The date is usually placed two lines below the last line of the letterhead at left margin for full block style or ending with the right margin for indented style.It is usual to show the date in the order day/month/year ( English Practice) or month /day /year (American practice).Avoid giving a date in figures and abbreviations.Inside AddressThe inside address is typed directly below the date line at the left hand margin.The inside address of a letter to an individual consists of the person's courtesy title, name, business or executive title ( it should be used immediately after the name) and address.When the letter is to a group, the inside address includes the full group name and the address.Care should be taken to address the recipient exactly as on the envelope.Salutation Salutation is placed at the left margin two lines below the inside address and two lines above the body of the letter.Considered a polite greeting with which a friendly business letter begins, the personal salutation must be appropriate for the first line of the inside address.If the letter is addressed to an individual, It is usual to use:Dear Mr. Smith,Dear Ms. John,Dear Prof. Hobart,Dear Dr. Walter,The trend is towards Ms. As the courtesy title for all women regardless of their marital status.When addressing a letter to a firm, Dear Sirs, Ladies and gentlemen or Gentlemen (American English ) would be used.Attention LineAn attention line is considered a part of the inside address and it leads the letter to a particular person or department when the letter is addressed to a company.It is usually between the inside address and the salutation or above the inside address ,as shown in examples:Attention: Import Dept.For the attention of Mr. Donnan, Sales managerAttention of Mr. Standard, General Manager.Subject lineThe subject heading is regarded as a part of the body of a business letter.Usually it is in the upper case or initial capitals/underline and placed between the salutation and the body of a letter to call attention to what content the letter is about. For example:Dear Ms. Smith,Our Catalogue No.2,Opening SentenceThe first paragraph of the body is introductory.It will always begin with reference to the previous letter received and provide an introduction to what will be discussed.Here are examples as follows:(1),Your letter of 9'' September to our Beijing (2),We refer to quotations of 8''october and our mail offer of 1'' December regarding the supply of Speedo swimming caps.(3)We acknowledge, with thanks, receipt of your binding application form for the 76'' international Exhibition in March, 1998.(4),We are pleased to inform you that the arrangements have now been made to ship the cotton underwear under your Order no.456.(5), We regret up to the time of writing we have not heard anything from you about the shipment under the captioned contract.Complimentary closeThe complimentary close is simply a polite way to end a letter.The expression for the complimentary close should match the salutation.It appears in the middle of the page and two lines below the closing sentence for indented layout.While it starts at the left-hand margin for fully blocked letters.Only the initial letter in the first word of any complimentary close is capitalized.PostscriptThe signature mainly consists of the addresser's signature, he typed name of his and his business title.Name of the company if it is previously printed on the letterhead.The addresser should sign the letter by hand and in ink above the typed name which the typed post。