Read the "mountain migration" -- ask the channel which is clear like this, to have the source of live water

I have read this book with a novel mentality. The role of the characters in the book is vivid, and I will introduce how yugong's descendants can complete a software project. MSF And Vsts . The small part of the character dialog in the book looks very interesting and has aroused a deep resonance among new users who are new to software development, such as us, in addition, I can learn a lot from a Chao's words. The following are some of my questions. I am very grateful for your answers.

Question:

1.
Simple development mode for migration to mountain, only Task And Bug , Indicating the expected and unexpected tasks. However Test
Case This type of work is still very good, it will not increase the extra burden, and produce Bug Can be followed Test
Case Link . I don't know what you think. Task
And Bug ?

2.
In250The value, technical feasibility, and urgency are taken into account when determining the priority of a function. However, urgency means that the user wants it very much and naturally the value is very high, after all, the software is intended for users. So what is the difference between value and urgency?

3.
The book describes how to write a good test plan and different test methods. But how should we choose these testing methods for software development?

4.
Does regression testing have to be fixed? Bug You have to repeat the previous test to ensure that the function does not return? However, if Bug Too much workload? Can I select a threshold, for example, a fixed number? Bug Then perform a regression test?

5.
For25I'm a little curious about the meaning of "black and white" on the page?

By

Zhang Ting