1.   The days of the week in which the lecturer works and gives a course are given in link records which need to be set up in these diagrams.

2.   Each link record is on two chains which connect the COURSE and LECTURER to it.

3.   These link records, sometimes called connector records, are usually meaningful in themselves.

4.   To cater for this possibility, link records need to be set up.

5.   As we saw earlier, this technique of setting up link records is used to represent networks.

6.   The link record is usually not redundant, that is, it contains useful information in itself.