@pwaring hard agree! I make a pretty complete data model even if it doesn't need to keep everything, or be indexed, or whatever. More than once this year it's paid off. I always parse all the input and stash it in the model before doing anything problem specific. Yes, it's inefficient and requires at least one more loop and more memory than necessary, but simple and naïve suits me ;)
(I do sometimes improve it later).
Next year, improved code will be much easier to understand and reuse.