### Instruction:

Extract the cause and effect entities from the following sentence:
This may be achieved either by benchmarking against internal documentation or by documented, formal review of the contractors method statements by the Technical Advisor

### Assistant:

EFFECT_1: This may be achieved
OR: or
CAUSE_1: benchmarking against internal documentation
CAUSE_2: documented
CAUSE_3: formal review of the contractors method statements by the Technical Advisor
VARIABLE: review of the contractors method statements by the Technical Advisor
CONDITION: documented
KEYWORD: by

