assuming that you have the following sentence in a requirements document

```
The system has to keep track of the names of publishers, their
addresses and telephone numbers

```

does that mean each publisher can have multiple addresses and multiple phone numbers ?.

again something like that

```
Information about the books’ names and author(s) is maintained in the database.

```

does that mean each book can have multiple authors ?

assuming this is not a real system ( can't get clarification from real clients ) what is the default decision i should take ?

this might not be very programming related , i was going to post this in English stackexchange site but i thought this is the right place since i am more concerned about the database design

thanks in advance