• fair mark, satisfactory mark
• contribution to knowledge
• to co-operate in attaining an end
• to co-operate in attaining an end
• effective, effectual, efficacious, efficient, expeditious, expenditious, fruitful
• to call forth, to effect
• effectively, in an effective way
• barren, futile, ineffectual, inefficient, of no avail, pointless, unavailable, unavailing
• to eventuate, to issue in sg, to result in sg