Bug- Any problem in existing functionality, or missing functionality. Defect in code or requirement, error which is not designed to be.
Issue (Impediment)- Any problem which might block the development process, example : a third party driver you identified as dependency is not releasing on time, so it is an issue in your development process.
Task- Any work which is planned as part of development of your project, either as result of bug, or issue or requirements, including requirement analysis or development, or testing. etc.
ISSUE - Is a problem reported by a user of the software that requires investigation. This could be a code bug or a requirement change (prior to it been made a change request)
BUG - Is a problem "in the code" confirmed by a developer. Information can be provided like possible causes and workarounds. Can be marked as fixed and link to source code check ins.
TASK - Is a work item that is given to people to complete. Such as a feature that needs to be completed. If it is a programming task, it can be linked to source code check ins.
Update
See comment below. Just remember, use the system in a way that benefits your team. Everyone works differently.
ISSUE - Covers everything about the project which may require some work or investigation. It is not necessarily an issue with the code, but it creates a stating point for investigation. If an issue is raised, which requires a change to the project it may lead to a bug or task.
Sometimes Error, Bug and defect is defined as A mistake in the code is called Error when it is identified by the testing team called a defect, and when it is accepted by the development team called Bug. If it does not meet with customer requirements as in the SRS document it is called Failure.
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对于 Scrum TFS 流程模板
错误 - 现有的任何问题功能，或缺少功能。代码或需求中的缺陷，非设计错误。
问题（障碍） - 任何可能阻碍开发过程的问题，例如：您确定为依赖项的第三方驱动程序没有按时发布，因此这是您开发过程中的一个问题。
任务 - 任何工作它被计划为项目开发的一部分，无论是由于错误、问题或需求，包括需求分析或开发或测试。等等
敏捷 TFS 流程模板
错误 - 错误通信您的团队正在开发的代码中存在潜在问题。
问题 - 事件或原因可能会延迟发货。
任务 - 任务进行通信需要做一些工作。每个团队成员都可以定义任务来代表他们需要完成的工作。
For the Scrum TFS Process Template
Bug- Any problem in existing functionality, or missing functionality. Defect in code or requirement, error which is not designed to be.
Issue (Impediment)- Any problem which might block the development process, example : a third party driver you identified as dependency is not releasing on time, so it is an issue in your development process.
Task- Any work which is planned as part of development of your project, either as result of bug, or issue or requirements, including requirement analysis or development, or testing. etc.
For the Agile TFS Process Template
Bug- A bug communicates that a potential problem exists in the code that your team is developing.
Issue- An event or cause that may delay shipping.
Task- A task communicates the need to do some work. Each team member can define tasks to represent the work that they need to accomplish.
以前我们用TFS的时候。
问题 - 是软件用户报告的需要调查的问题。这可能是代码错误或需求更改（在发出更改请求之前）
BUG - 是开发人员确认的“代码中”问题。可以提供可能的原因和解决方法等信息。可以标记为固定并链接到源代码检查。
任务 - 是交给人们完成的工作项目。比如需要完成的某个功能。如果是编程任务，可以链接到源代码签入。
更新
请参阅下面的评论。请记住，以有利于您的团队的方式使用该系统。每个人的工作方式都不同。
问题 - 涵盖可能需要一些工作或调查的项目的所有内容。这不一定是代码的问题，但它为调查提供了一个起点。如果提出问题，需要更改项目，则可能会导致错误或任务。
When we used TFS in the past.
ISSUE - Is a problem reported by a user of the software that requires investigation. This could be a code bug or a requirement change (prior to it been made a change request)
BUG - Is a problem "in the code" confirmed by a developer. Information can be provided like possible causes and workarounds. Can be marked as fixed and link to source code check ins.
TASK - Is a work item that is given to people to complete. Such as a feature that needs to be completed. If it is a programming task, it can be linked to source code check ins.
Update
See comment below. Just remember, use the system in a way that benefits your team. Everyone works differently.
ISSUE - Covers everything about the project which may require some work or investigation. It is not necessarily an issue with the code, but it creates a stating point for investigation. If an issue is raised, which requires a change to the project it may lead to a bug or task.
MSF Agile 工作项类型
MSF Agile 包含以下工作项类型：
MSF CMMI 工作项类型
MSF CMMI 包含以下工作项类型：
请参阅此处描述工作项类型详细信息的链接：
http://msdn .microsoft.com/en-us/library/ms400752.aspx
http ://msdn.microsoft.com/en-us/library/bb668962.aspx
MSF Agile Work Item Types
MSF Agile contains the following work item types:
MSF CMMI Work Item Types
MSF CMMI contains the following work item types:
Please refer the links here which describes the details of Work Item Types:
http://msdn.microsoft.com/en-us/library/ms400752.aspx
http://msdn.microsoft.com/en-us/library/bb668962.aspx
有时错误、错误和缺陷被定义为
当代码中的错误被测试团队识别为缺陷时，称为错误；当它被开发团队接受时，称为错误。如果不符合 SRS 文档中的客户要求，则称为失败。
Sometimes Error, Bug and defect is defined as
A mistake in the code is called Error when it is identified by the testing team called a defect, and when it is accepted by the development team called Bug. If it does not meet with customer requirements as in the SRS document it is called Failure.