IMS are not only a member of the Direct Marketing Association (DMA), but also the first (and currently only agency) to hold the DMA Field Marketing Best Practice Accreditation. For further information on the DMA Field Marketing Best Practice Accreditation, please click here. Other field marketing agencies that are also members of the DMA include the following:

Adept Marketing Group
Arma Direct
Blackjack Promotions Ltd
Carlson Marketing
Communicator
Contact Field Marketing and Solutions Ltd
Cosine UK Limited
CPM (United Kingdom) Ltd
DQM Group Limited
Field Sales Solutions
Headcount Worldwide Field Marketing
Impetus Communications Ltd
Instore Field Marketing
IQ Field Marketing Ltd
Merchandising Sales Force Ltd
Momentum
N2O Ltd
National Marketing Services
odm ltd
Phiz
PMI Field Marketing
PromoPower Ltd
REL Field Marketing
SMC Field Marketing
Sure Field Marketing Limited 
The FDS Group of Companies
The Network (FMP) Ltd