For any advertising to be effective it has to be seen, register with your target audience, increase awareness and stimulate response or future recognition. For this sequence to occur it stands to reason that your advertising has to be placed where it will reach your target, is delivered via the most apt media and communicates your message in an effective and creative manner.
TCA research, schedule, negotiate, purchase, co-ordinate and manage strategically planned campaigns that will ultimately stretch your budget as opposed to merely spending it.