* Boolean: is yes, or is no

* Selection: the selected value is in a specific subset of values

* Date: the value is N days before and/or after today or a date in another answer

Using these same conditions, the administrator can define questions that are

conditional on other questions' answers.  These questions are only presented

For illustration purposes, the common deployment is expected to have

relatively few unconditional questions about each expense (type of expense,

receipt, amount), and then a series of conditional questions based on those

answers (e.g., follow-up questions specific to airfare expenses,

accommodations expenses, etc.).

### Requestor workflow

create a new request, which starts either the Pre-Approval or the In Progress

state.

When they view a report, it shows the questions and answers about the entire

report, and a list of associated expenses.  Viewing a specific expense

similarly shows all the questions and answers about it.

Submitted state.

### Bookkeeper workflow

Bookkeepers can log into the system and see all requests.

state, and include a note explaining why the report was moved to that state

(e.g., moved back to In Progress because a specific receipt was insufficient

documentation).  When they do this, the system sends e-mail to the requestor

letting them know about the change, including the rationale provided by the

bookkeeper.