• Explain why side-effects must be as small as possible (in terms of code size)
• What is the advantage of a protocol implemented without I/O?
• What is the purpose of splitting logging and monitoring from features?
• Cite three reasons why an application does not behave as expected
• How can a trace observer be used to debug an application where nothing happens?
• What issue can occur when creating an observable without specifying a scheduler?
• What issue can occur when a cold observable is subscribed to several times?