*********声明：本系列课程为Cem Kanner的软件黑盒测试基础的笔记版**************

What‘s A COMPUTER PROGRAM?

Textbooks often define a "computer program" like this:A program is a set of instructions(指令) for a computer.

That‘s like defining a house like this: 

• A house is a set of construction materials assembled(建筑材料集合) according to house-design patterns.

I‘d rather define it as:

• A house is something built for people to live in.

The second definition focuses on the Stakeholders(for people) and Purpose(to live in), rather than on its materials.

Stakeholder(项目相关人): Any person affected by(受到……影响): success or failure of a project, or,  actions or inactions of a product,or effects of a service.

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A DIFFERENT DEFINITION

• A computer program is:
• a communication
• among several humans and computers
• who are distributed over space and time,
• that contains instructions that can be executed by a computer

The point of the program is to provide value to the stakeholders.

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WHAT ARE WE REALLY TESTING FOR?

Quality is value to some person----Jerry Weinberg

Quality is inherently subjective(质量天生就是主观的). Different stakeholders will perceive the same product as having different levels of quality.

Testers look for different things for different stakeholders.

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SOFTWARE ERROR

An attribute(属性，品质) of a software product

• that reduces its value to a favored stakeholder
• increases its value to a disfavored stakeholder
• without a sufficiently large countervailing benefit

An error:

  May or may not be a coding error, or a functional error. Design errors are bugs too.

--未完待续