How do I keep my event sheet clean

I am looking for general advice (a good practise) about how to implement a scoring/points system in your event sheet.

For example:

• make a "scoring" group and insert here all (if possible) events that have to do with accumulating points?
• afer each event that blows up a spaceship or jumps on an enemy place the events: show score + add points to score?

I personally recommand using a variable to keep track of the score, and using a function to add points to the score (this function could also take care of refreshing the score display, and even the high score display if needed), and also to make the score goes up not with direct numbers but with variables (instance variables or local variables) and constants if possible, so you can edit quickly how you handle the score.