@MrMoody - I actually like the concept of the hierarchical model. I don’t know that I’ve used it. The closest I’ve come has been working with XML files, which pretty much order everything in a hierarchy.
I don’t know if you would consider XML files databases however. Regardless, the hierarchical model is intuitive. The parent-child relationship makes sense and is similar in some sense to the relational model, except that the relational model is a bit more arbitrary in its relationships from what I understand.