What key data do you collect to prove capability? Not just Molding Process, but entire process from material readiness to proper packaging.

Not speaking of how to do a "Capability Study", but looking for pointers on developing a metric for new product launch. What recordables make the most sense to track without making it too complicated.

We are a very custom injection molder with an average of 90+ new parts per year and inevitably projects get launched to production that still need work, this is most often due to time to market constraints that our core customer's have. We need to improve this for sure, but cannot do it by quoting extra lead time to the tool build and qualification process.