Table Of Contentiabuk.net
The Big Affiliate  
Marketing Handbook
Contents
   Introduction          2
1  Value            4
2  Optimisation          20
3  Policy            50
4  Futures and Opportunities      58
   Glossary          78
by Clare O’Brien 
Introduction Chair, Affiliate Marketing Council  
& Senior Industry Programmes Manager, IAB
Welcome to the second IAB Affiliate Marketing 
Handbook. In the 5 years since the first was published 
in 2009, the Affiliate Industry – like the rest of the digital 
marketing and advertising industry – has undergone a 
transformation. More commonly referred to as Online 
Performance Marketing, this is an advertising channel 
that buys brand benefit as well as customer loyalty 
and a directly measurable ROI in the form of sales.
Given that in 2013 the industry drove some 10% of the  This handbook, the work of the IAB’s Affiliate Marketing 
UK’s eCommerce traffic and commanded a marketing  Council, exposes the industry’s diversity and even 
spend of £1bn according to the PwC / IAB OPM study  if you thought you knew affiliate marketing, you’ll 
(see page 6), it’s a permanent (and growing) feature  probably be surprised by some of the marketing 
of integrated digital marketing programmes. In  opportunities mapped out in these pages. If 
fact it’s a channel that exemplifies just how digital  you’re new to digital or haven’t used affiliate 
is merging marketing and sales channels.  marketing before, this handbook will help you 
understand the industry’s value and mechanics.
Affiliate Marketing is not a ‘channel’. Rather it’s an 
advertising objective. Affiliate campaigns deploy  Overall, this handbook represents one of the fastest 
most digital advertising and marketing disciplines  growing digital marketing channels which many of 
including email, display, content, search, social  the UK’s top advertisers recognise as highly effective 
media and audience targeting. It works across mobile  and are thus increasing their investment in. This 
platforms, uses programmatic methods and is now  isn’t simply because its yields are extraordinarily 
establishing exciting offline opportunities for digital  high (14:1 ROI); it’s also because it’s a flexible 
marketers. Affiliate data is packed with audience  and creative space to work within that touches 
and customer insight providing marketers with  customers throughout the marketing funnel. 
customer journey and point-of-sale perspectives 
that enrich standard advertising analytics.
May 2014 3
1
Value 1.1     Online Performance 
Marketing Study
1.2    Integration
1.3    The value of affiliate data
1.4    Flexibility
Demonstrating the breadth and impact of the 
affiliate channel, its flexibility to meet a variety 
of objectives, and the importance of planning 
activity as part of an integrated approach
Online Performance Marketing Study 1.1
1.1 
Online Performance 
Marketing Study by Kevin Edwards 
Strategy Director, Affiliate Window
Measuring the scope of performance marketing 
In the last 6 months, 
is more difficult than you may think. Given that 
over 40% of survey 
advertisers are looking at some sort of delivery 
respondents have used a 
Affiliate Window is a global performance marketing 
mechanism or return on investment against the 
network built on five core beliefs; SERVICE – ETHICS 
price comparison, subject 
– TECHNOLOGY – PERFORMANCE and INNOVATION.
majority of their digital marketing channels, it’s difficult 
We exist to provide our clients with the best service 
expert loyalty website or 
and technology available in performance marketing. 
to know where performance starts and ends.
Our aim is to exceed expectations in everything we 
entered a competition
do. For a fresh, innovative and ethical approach, 
Affiliate Window has all the right ingredients.
As the traditional affiliate and lead generation  One of the most compelling pictures to emerge 
channels have never had hard data to contextualise  from the latest study is the diversity of activity the 
the size of the industry, the IAB’s Affiliate Marketing  channel encompasses, with price comparison, 
Council took the decision two years ago to measure  editorial, cashback, voucher codes and loyalty 
spend on affiliate marketing, lead generation  all featuring as important revenue drivers.
and other acquisition focused activity.
This has always been one of the channel’s strengths: 
In the last 6 months, which  
It was with nervousness that performance marketers  offering retailers multiple routes to market based on 
of the following have you used?
awaited the results of the first IAB / PwC Online  their brand and product fit. The continued growth of  58%
Performance Marketing Study (OPM). They needn’t  telecoms publishers within the channel has seen price 
52%
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rsoaulensd o £r1 1b0n% fi ogfu UreK i ne c2o0m13m geerncee.r aTthineg in £d1u4sbtnri ewso trhtha to f  osuf rbvuedyg seutb. Imt iist tiemdp doarttaa n(at  tsoi zceoanbslied epro trhtiios nis i sa lmsoo dfreolmle d  spon 39% 37%
e
make up the performance marketing ecosystem  up by PwC) so is reflective of what more ‘traditional’  of r 30%
can confidently talk about some of the most  affiliate marketing campaigns are experiencing. e 
compelling dividends of any marketing channel. ar 22%
h
S 15%
The collective effort by affiliate networks, publishers, 
11% 10%
third party tracking platforms, advertisers and agencies 
to collate the numbers has also resulted in additional 
areas of the industry being assessed such as sector 
and publisher strengths, the growth of handset 
transactions and breakdown of commission trends. Entere d a Pcriocme pceotimtiop naSriusbjoen cts iteexsp ert w e bsLitoeyalVtoy uwceh ebrSs iitcgeondeed  wu ep tbsoi tae n eCwaslsehtbtPaerrcokv iwd eedb sipteerMssoobnilale /dveotuaiclshRere qdueeasl tae pd pa call b ackN o n e of th ese
6 Source; IAB / PwC Online Performance Marketing Study, 2014 7
1.1 Online Performance Marketing Study Online Performance Marketing Study 1.1
Content pips voucher and rebate websites to sit third,  If we consider other trends from the OPM Study  That said, commission breakdown data also included  There is no doubt the OPM Study has helped 
with paid search and ‘other’ in fourth and fifth place.  it’s no surprise that handset traffic and sales have  in the study highlights a growing trend of recognising  put affiliate and the wider performance channel 
As the channel grows in complexity and with mobile  shown significant year on year growth, mirroring  and rewarding value beyond the standard CPA (cost  on the map. Boasting phenomenal ROI and 
making huge strides over the past 12 months, we  the wider online trend of consumers transitioning  per acquisition) metric. Tenancy deals and content  exceptional publisher diversity the stage is set for 
can only expect that picture to further diversify. between devices at different points during the day.  sponsorship witnessed a 60% growth between 2012 and  advertisers to upscale their budgets and cement 
The challenge for any marketer is now to marry  2013 to account for around 5% of the channel’s spend. the industry at the heart of their online plans.
From a sector point of view (and again focusing on 
that data to measure consumer purchase paths.
submitted data) retail accounts for twice the advertiser  There is undoubtedly a trend for certain publishers 
spend of the next biggest category, that of travel and  A new measurement for 2014 is the inclusion of  and advertisers being able to secure additional 
leisure. Close behind sits telecoms and finance. Typically  interactions delivered by the channel. At over 4bn  budget for promotional activity that reflects 
a retail programme will boast a much longer tail of  clicks (or 500,000 an hour) generated by an industry  their growing status as brand partners.
affiliates than a service sector programme. This can  that is only payable on a cost per acquisition model, 
be attributed to the greater reach of general shopping  this phenomenal figure shows the hidden brand 
sites, blogs and price comparison, as well as the  engagement value of the channel that is rarely 
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Online Performance Marketing 
expenditure by advertisers, 2013
Other 
includes CPM, CPP, fixed fee 
CPL and other payment models
c.8–10% of UK digital marketing spend
CPC 
includes major price comparison 
CPC sites and travel aggregators. c.10% of UK retail ecommerce
Ultimately these transactions are 
measured on sales generated for  c.0.8% of UK GDP
CPA
advertisers, but advertisers agree to 
pay on a CPC rather than CPA basis
8 Source; IAB / PwC Online Performance Marketing Study, 2014 9
Integration 1.2
1.2 
Integration by Mohammed Lakha 
SMG Acquisition, Starcom MediaVest Group
This section looks at the importance of planning affiliate  The interesting point to note from the image below is  From a budgetary perspective, it is important to 
that affiliate sites fall within all stages of the purchasing  evaluate whether your offering requires an informed 
activity alongside other areas of online as part of a  funnel. Whereas historically it was widely regarded  and calculated decision. If this is the case, more 
that display was used to create brand awareness  investment will need to be made with sites earlier 
multichannel strategy. Discussing attribution, how affiliates  and interest (and therefore paid on a CPM), search  in the purchasing funnel including niche content, 
was used when a consumer was considering their  blogger and review sites where consumers go to 
sit within the consumer journey and how learnings  options (hence paid on a CPC), and affiliates were  read up about different opinions and whether these 
tasked with closing the sale (and so paid on a CPA),  opinions suit their desire to purchase. However, it 
from this can dictate strategy and budget allocation. the below model illustrates how affiliates are involved  is worth noting that even some of the affiliate sites 
from the very start. Because of the fact that they are  that are viewed as sitting at the consideration and 
only rewarded when an acquisition is produced the  preference stages have now found themselves creating 
Over the past few years, there has been an increasing  Thirdly, the devices through which users navigate  work they do further up the funnel is effectively free.  brand awareness and interest in products through 
shift towards a multichannel marketing approach  the path to purchase are multiple. Most advertisers  This is a much neglected selling point of the channel  their huge followings with some affiliates surpassing 
from companies looking to achieve a more integrated  recognise the need to have mobile-optimised  and not often reflected in the remuneration. a mammoth 300,000 followers on social media. 
campaign. Their aim here is not just to measure all  sites, but as there is at present no accurate way to 
channels in a holistic way, but to glean from this data  measure a single user’s behaviour cross-device, 
an actionable strategy to apportion spend to the most  where mobile channels feature prominently in the 
efficient channels, usually defined on the basis of ROI.  path to purchase it makes little sense to talk about a 
However there are a number of challenges here.  cross-device attribution model. This in turn hampers 
the reliability of a cross-channel attribution model. 
Firstly, there is no one-size-fits-all model for a 
cross-channel attribution model. This is because  Ultimately, when planning your marketing strategy, 
different sectors have different purchase funnels  it is a good idea to think of how you purchase online 
over different times (think of the difference between  as a consumer. When buying a shirt online or a pair 
a considered purchase in the travel sector versus  of headphones the amount of different touchpoints 
FMCG) and, despite commonalities in the customer  or sites you visit are very likely to be much less than 
journey, individual advertisers will work with their  if you were buying a new mobile phone or a holiday 
Awareness Display | Affiliate
referral channels in different ways making the picture  as these purchases require much more thought 
different for each advertiser within a sector. before coming to a purchasing decision. Although 
each site differs in nature, it is difficult to measure the 
Secondly, user behaviour is changing all the time 
as new actors come into the digital ecosystem.  influence each one had on the eventual decision.  Interest Display | Affiliate
Social, programmatic display and retargeting in 
particular feature more and more in the user’s 
journey and so any attribution model must both 
Consideration Display | Search | Affiliate
reflect and keep pace with these changes. 
Preference Search | Affiliate
Sale
1100 11
1.2 Integration Integration 1.2
Although the affiliate channel is relatively small both  Instead, two fundamental questions should be   Number of bookings (%) v channel ROI (£)
in terms of size and allocated marketing budget,  asked about the place of affiliate activity in the  
it certainly does punch above its weight. The bar  multi-channel mix. Firstly, what is the publisher actually 
chart opposite shows the results of a cross-channel  doing for you as an advertiser? What exposure are 
analysis by Starcom on all paid, owned and earned  they providing, to what audience is this targeted, and 
media channels for Flybe across an 18-month period.  does this hit the consumer at the right point in their 
It showed that the affiliate channel produced the  purchase funnel? Secondly, rather than just looking 
highest ROI of all activity, online and offline.  at the path to conversion, what types of customer 
is the affiliate channel referring? Are these high 
It has been repeatedly demonstrated from independent 
quality customers that are well-matched to the target 
studies that shoppers coming via affiliate sites are 
audience, with low levels of churn and high return 
often more affluent, spend more on average but 
purchase rates? And if not, which publishers within 
also shop more frequently. It follows that the lifetime 
the channel are performing better than others?
value of an affiliate channel customer is much 
higher. Therefore, it is important to acquire these  This chapter has discussed the integration of the  
consumers throughout their decision making process  affiliate channel with other online channels. It is 
and work in tandem with other online channels to  important to stress that mastering this integration does 
ensure the effective conversion of that consumer  not necessarily mean developing an attribution model. 
from a merely interested party to a new customer. Moreover, an attribution model may be better used for 
planning and understanding the user journey than it 
With the affiliate channel working on a last click 
is for developing a new payment model based on the 
model and potentially many sites featuring within 
role of each channel in the user’s path to purchase. 
the purchasing funnel from awareness to sale, an 
If the affiliate channel features at every point in this 
alternative method of compensation to affiliates  
funnel, it is too simplistic to treat it as a channel that only 
by virtue of attribution has been widely debated 
contributes value at the point immediately prior to sale. 
and disputed. However the instances in which 
such models have been put into practice are 
few and far between, and the case studies 
demonstrating their success even fewer. 
Bra n d PNPoCn Bra n d P P C Display Bra n d T V S ale T V S p o ns T V N atiRoandialo Press Bra nRde gio n al PressO ut of H o m e Affiliates
Bookings (%)
Channel ROI (£)
12 13
The Value of Affiliate Data 1.3
1.3 
The Value of  
Affiliate Data by David Ayre, Account Director, TradeDoubler &  
Julian Bazley, UK Director, United Digital Group
Whether you are building an affiliate programme  Who tracks what Looking beyond the last click 
from scratch or overhauling an existing programme,  Advertisers, networks, publishers and agencies  The foundations of the affiliate industry were 
are continuously collecting data that can be used  created on the back of a ‘last click wins’ model.
the value of affiliate data is something that is often  to gain valuable insights into each part of the 
By scrutinising the data collected across the affiliate 
user journey and purchase behaviour. The vast 
channel, it becomes clear why performance marketing 
overlooked despite being the pillar of almost every  levels of data collected across the channel provide 
is growing at such an immense rate today. The value 
advertisers with the opportunity to evaluate 
affiliates bring to an online marketing mix goes way 
online success story since the internet began. performance and gain insights into areas not 
beyond straight revenue growth into areas including:
typically associated with the affiliate channel:
Brand exposure
User journeys 
In an industry that has generated over £1 billion in 
Whilst not all banner impressions are tracked  
sales revenues and over 4 billion clicks (and at the  Understanding touch points and behaviours 
from the affiliate channel, 4 billion clicks equates to 
same time achieved 5% conversion rates across  that ultimately lead to the final transaction.
hundreds of billions of impressions across the UK. 
12,000 publishers websites in 2013), the importance 
Promotional opportunities 
of affiliate data and its value for developing  Early adopters
scalable strategies should not be overlooked.  Giving a unique view of consumers’ search 
Recent digital trends such as consumers  
patterns and purchase behaviour.
By understanding data collected from various  shifting purchase behaviour to mobile devices  
sources, advertisers gain valuable insights that  Strategic planning  are identified early allowing advertisers to develop 
extend further than online purchasing trends  strategies for mobile or responsive websites.
By looking beyond the last click, advertisers can develop 
(such as the shift of consumers to mobile devices). 
cross channel strategies that add long term value to  Assistance with converting other marketing channels
With seemingly endless amounts of data being 
their brand whilst also achieving revenue growth.
collected it’s important to understand who tracks  The very nature of affiliates earning revenue 
what and how it can be put it to good use. on a last click model encourages high 
levels of conversion where other marketing 
channels may not have ‘closed the deal’. 
Clicks to bricks – driving footfall 
from online advertising
Large affiliates are increasingly moving towards models 
that encourage footfall in to stores across the country.
14 15
1.3 The Value of Affiliate Data The Value of Affiliate Data 1.3
Putting affiliate data to use Advertisers
Through the analysis of data, advertisers can deliver 
effective integrated marketing campaigns that can 
be reviewed and optimised to deliver enhanced user 
experience and increase revenues whilst strengthening 
brand messages that ultimately deliver substantially  Ad spend intelligence
improved ROI. This often blurs the lines between 
affiliate and other marketing channels and can aid the 
Consumer insights 
transition to an omni-channel marketing strategy. 
The uses of data collected from the affiliate channel 
Strategic planning
are almost endless and can benefit advertisers 
and publishers alike when shared effectively. 
Targeted promotional activity
In today’s ultra competitive online space, it’s crucial that 
commercial and marketing strategies are formulated 
armed with the facts. Napoleon Bonaparte said: “War 
is ninety percent information” and the same is true 
when competing for placement to grow your revenues.
All this said, the true value of affiliate data sits beyond 
Publishers
any one individual organisations’ personal gain. By 
effectively combining data from multiple sources, truly 
engaging collaborations can be developed that benefit 
consumers, advertisers and publishers alike. In my 
mind this is exactly what affiliate marketing should 
be and is the foundation of performance marketing.
Personalisation
Consumer insights
Targeted promotional activity
Ability to optimise campaigns & promotions
16 17
Description:expert loyalty website or entered a competition by Kevin Edwards. Strategy Director, Affiliate Window. 6. 7. Online Performance Marketing Study. 1.1