How do you handle entity statuses?

As part of what I am developing now, I needed to handle different entities' statuses. Although developing for decades, I was yet tempted a little bit to use a boolean. Fortunately ;-) found a great status patter description with explanations!

Software Development Tasks

Just a few unsorted thoughts about tasks that needs to be done by somewho in the development/managing team:

• Prioritize tasks/issues
• Define how should it be implemented (how should we treat overlapping appointments in function GetNextAppointment() )
• Choose the best technology/strategy/...
• Estimate the time
• Check the progress according to the estimation
• Review the final code