top-down thinking

感觉有时候说东西的时候会bottom up

需要先从top-down想好，说什么，这样比较容易明白

比如datastage component

1. whole objective

2. each component objective

3. what to talk about each component (give insight - automation, scalability? (concern of client))

现在是随着flow讲，没有top-down

Pros:

1. easy

2. still able to understand after iteration

Cons:

1. not memory or understand efficient

2. not concern about client-concern