Strengths and weaknesses of different modes

Expository

This is the opposite of observation, as it relies on the narrater to tell the story. The strength of this is that you have someone to explain it to you, so there's no trying to work it out with just visuals to help you. The bad thing about it, is that it can become boring if we just rely on the voice over.

Observational

This can be good although a bit unusual for a documentary, as you can only know what's going on by what you see. It can be good as it makes you think more about what's going on rather than having someone explain it to you word by word. But the weaknesses are it can take a bit long and sometimes if it's narrated, you can understand it more.

Participatory

You can interact with the character (like seven days) which is good as you get a sence of knowing them personally, however you need to know whats going on with the story line and also need to commit to keeping in contact.