What is great software?

I bought headfirst OOAD. It seems quite enjoyable. The first chapter is as follows:

 

What is great software?

 

 

First, great software must satisfy the customer and do what the customer wants. (Win the hearts of customers)-- Requirement

And even if the customerWhimsyTo use the software in a new way, it can still deliver the customerExpected results.

Second, great software is well-designed, well-coded, and easy to maintain, reuse, and expand. (Let yourProgramAs smart as you are)-- Design

 

 

Three simple steps for writing great software:

1. confirm that your software does what the customer wants it to do.-- Confirm requirements and analyze requirements

2. Use Basic oo principles to increase software flexibility.-- Do not reuseCode, Using OO programming technology

3. strive to achieve a maintainable and reusable design.-- Use the design mode