The following types of observations are strongly recommended to be submitted as HOPs, regardless of whether the proposers are inside or outside the Hinode team:

• Coordinated observations with ground-based facilities and space-borne instruments, if the period/time specification is critical.
• Coordination among more than two Hinode instuments if there is a critical time constraint to the observations, or if both instruments are required to consume significant telemetry resources.
• Observations requiring telemetry volumes which are a large percentage of the regular allocations of the instruments.
• Coordination with IRIS (through an IHOP)