Eliminate, Reason, Alternatives.
For an existing process or product, choose several important features or aspects, and answer:
1. Can we eliminate the feature?
example: "credit card and signature is carried with you"
Usually - no
2. Reason - why can't we eliminate it? what is the crucial benefit provided?
Example: "Credit cad possession and signature used to authorize purchases"
3. Alternative(s): How else can wee achieve that goal?
Example: "use fingerprint to identify credit carrier"
Doing so for multiple features may hint at areas of innovation.