Supervised machine learning trains a model using examples containing both input features and known output labels. Historical support tickets can include characteristics such as issue category, priority, customer type, and complexity, together with the actual resolution time. The model learns the relationship between those labeled examples and then predicts resolution time for new tickets. The remaining scenarios focus on discovering previously unknown structures in unlabeled data. Identifying customer segments from purchase history and finding behavior clusters from website clicks are clustering tasks. Automatically discovering recurring topics in customer reviews is generally a topic-modeling task. These are examples of unsupervised learning because the system is not trained against predetermined target outcomes. Therefore, predicting resolution time from past support tickets with known resolution-time labels is the clear example of supervised machine learning.