[eggroll]

in essence yes, a bottleneck is a 'constraint'

Rough example, you have 100 pieces of raw S30V slugs that need to processed, 4 processors are available, but each processor can only process 10 pcs per hour.
you have to have these done in 2 hours, if all goes 'well' you would have been able to process 80 pcs, what about the remaining 20 pcs?

adding another processor 'resource' could have fixed your problem, but alas he is a junior processor and can only process 5 units per hour....

so basically this scenario is constrained by a resource bottleneck combined with a unrealistic timeline.