I generally just determine what would actually be a progression (more challenging to the muscle) and implement over time. Even using the same actual weight and sometimes focus on increasing reps, then add a set next time, then drop the volume and increase weights, and repeat that. This focuses on long term progression as opposed to short term. Over longer periods there is progression, and the drop in volume/slight increase in weight is a nice little semi-recovery session.
Otherwise with intensity techniques doing standard sets, then next time doing 1+1/4 reps, then pure negative accentuated has been a progression I've used. Then next time increase weight and back to stock standard rep-style. Can get really creative but takes a bit of know-how (and reeeeally good technique is super important).
Some intensity techniques it's really hard to delineate a legitimate progression, but like I said I mainly use it to spice things up and explore different styles of training.
Used to be suuuuuper scientific, rigid and consistent, which is better for results, but now am more loosy-goosey.