Coffee cupping is the objective evaluation of coffee characteristics and quality and a basis of specialty coffee trade value and recorded on a coffee cupping form.
The links below are to popular cupping scoresheets and their respective protocols:
Arabica Cupping Forms
Specialty Coffee Association of America Scoresheet
SCAA cupping protocols (from SCAA.org website)
Also consider Catador, an independently developed electronic version for iPhone and iPad that follows SCAA Arabica and UCDA Robusta protocols. Read my review of Catador here. Download Catador on iTunes.
Cup of Excellence scoresheet
Arabica Naturals Cupping Form
Robusta Cupping Forms
Uganda Coffee Development Authority Robusta scoresheet