effective communication effective communication skills effective communication strategies effective communications effective communicator effective communicators effective community effective competition effective compliance effective component effective compounds effective concentration effective concentrations effective conflict effective conservation effective consultation effective consumer effective content effective content marketing effective contraception effective contraceptive effective contribution effective control effective controls effective cooling effective cooperation effective coordination effective corporate effective cost effective course effective coverage effective crime prevention effective criminal effective crisis effective cure effective customer effective customer service effective cutting effective daily effective data effective date effective dates effective december effective decentralization effective decision making effective decision-making effective decisions effective defence effective defense effective delegation effective delivery effective demand effective democracy effective democratic effective deployment effective design effective deterrent effective development effective development cooperation effective device effective diagnostic effective dialogue effective diameter effective diet effective digital effective digital marketing effective disaster effective discipline effective disease effective disinfectant effective dispute effective dissemination effective distance effective distribution effective domestic effective dosage effective dose effective doses effective drug effective drugs effective due effective duration effective early effective economic effective education effective educational effective element effective email effective emergency effective employee effective end effective energy effective enforcement effective engagement effective enjoyment effective enterprise effective environmental effective equality effective european