### Instruction:

Extract the cause and effect entities from the following sentence:
It is recommended that further evaluation on the impact of L–DACS transmissions on the incumbent L-band system receiving systems be performed when the L–DACS design has sufficiently matured

### Assistant:

NOT_RELEVANT: It is recommended that
VARIABLE: the L–DACS design
CONDITION: has sufficiently matured
KEYWORD: when
CAUSE_1: the L–DACS design has sufficiently matured
EFFECT_1: further evaluation on the impact of L–DACS transmissions on the incumbent L-band system receiving systems be performed

