The flowchart is arguably the oldest modeling tool in software engineering. Its sim‐ plicity, with a handful of symbols, makes it adaptable enough to illustrate the logic of the first program you wrote at school or a complex workflow at your organization. A workflow captures the different steps or processes involved in fulfilling a business functionality, often mixed with business processes. For example, onboarding a new employee in your organization is a process, and the workflow involves several steps, both manual and automated. The advantage of capturing a business process as a sequence of input, output, actions, tasks, decisions, etc., is that you can automate the entire process to improve efficiency.