Tres important

The strange stuff at the front of diaries – who designs that? Is that a job? To decide that area codes around the world are important, that conversions of international paper sizes are important (I kid you not) and that each month we will want to keep track of staff leave as well as incoming and outgoing financial totals. Who decides that, for example, the words for ‘hello, where is the toilet?’ in all known human languages is not useful for the front of the diary, or that a chart of the moon not so important. What would you put at the front of a diary as crucial information for all people traveling through space and time?