The first two steps of CRISP-DM are:

1. Business Understanding - this means understanding the problem and questions you are interested in tackling in the context of whatever domain you're working in. Examples include

• How do we acquire new customers?
• Does a new treatment perform better than an existing treatment?
• How can improve communication?
• How can we improve travel?
• How can we better retain information?

2. Data Understanding - at this step, you need to move the questions from Business Understanding to data. You might already have data that could be used to answer the questions, or you might have to collect data to get at your questions of interest.

3. Prepare Data

Luckily stackoverflow has already collected the data for us. However, we still need to wrangle the data in a way for us to answer our questions. The wrangling and cleaning process is said to take 80% of the time of the data analysis process. You will see that will hold true through this lesson, as a majority of the remaining parts of this lesson will be around basic data wrangling strategies.

We will discuss the advantages and disadvantages of the strategies discussed in this lesson.