# ass-020

Suppose that:

- The user can create, update and delete their buckets and pipes
- When the user creates, updates and deletes their buckets and pipes, they see a
  prominent number which they know summarises what the long-term difference
  between their incomings and outgoings will be if they stick to the intentions
  expressed in their buckets and pipes
- When the user creates, updates and deletes their buckets and pipes, they see a
  prominent number which they know summarises what the difference between their
  incomings and outgoings has actually been in the past

Then the user will create, update and delete their buckets and pipes so that:

- The first number remains close to zero
- The second number remains small and positive