I think in most cases when you add a feature you end up touching everything in each of the layers.

It's only when you want to change something that it's possible that you might just be restricted to one layer.

I think the idea of the template is that you have one template and many views, and possibly that a template can be created of many different smaller templates, e.g. header, footer, sidebar.

Here is an example of something that I wanted to do with a very specific template that wouldn't be used on any other page.

My model gives distance in meters, for each of the objects and I wanted to display it in miles. So I had to add a new method to the model dist_miles. Instead of just saying round(cinema.dist / 1600, 2) in the template.

I've only been using django for a week now so its quite possible that I'm going about it all wrong.