In Odoo, we can implement workflows centered on documents. What we refer to as documents can be things such as sales orders, project tasks, or HR applicants. All of these are expected to follow a certain life cycle since they're created until they come to a conclusion. They're recorded in a document that will progress through a list of possible stages, until it is completed.
If we present the stages as columns in a board, and the documents as work items in those columns, we get a Kanban board, providing a quick view over the work in progress.
There are two approaches to implement these progress steps are usually referred to as states and stages.
States are implemented through a closed selection list of predefined options. It is convenient when implementing business rules, and models and views have special support for the state field, to have required and invisible attributes set, according to the current state. It has the disadvantage that the states...