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Not All Service Attributes Are Equal: Ranking Service Attributes by Their Correlation to Loyalty

Research without a call to action may be informative, but not very useful.  One way to build a call to action element into your customer experience research is to add a measure of customer loyalty.  Loyalty can serve as a basis for evaluating which elements of the service mix are most important in terms of driving customer loyalty, and as result, have more potential ROI.

Measuring customer loyalty, however, in the context of a survey is difficult.   Surveys best measure attitudes and perceptions.  Loyalty is a behavior.  Kinesis has had success with a model for estimating customer loyalty based on two measurements:

  1. Promoter: This is measured with the likelihood of referral to a friend relative or colleague, using a numeric scale.
  2. Trust: Trust is measured by capturing agreement with the statement, “the company cares about me, not just the bottom line.” Again answered in a numeric scale.

These two measures are combined together to calculate a loyalty index, which visually is the linear distance of the plot of these two measurements from the highest possible value for each scale (cases where promoter and trust received the highest possible rating).

Trust Promoter Plot

Mathematically, this index can be calculated with the following equation:

Loyalty Index Equation


T = Trust rating
P = Promoter rating
ST = Number of points on the Trust scale
SP = Number of points on the Promoter scale

Note this index measures the distance from the ideal or most loyal state.  Lower values estimate stronger loyalty.

Calculating a loyalty index has value, but limited utility.  A loyalty index alone does not give management much direction upon which to take action.  One strategy to increase the actionably of the research is to use this index as a means to identify the service attributes that drive customer loyalty.  Not all service attributes are equal; some play a larger role than others in driving customer loyalty.

So…how does the research determine an attribute’s role or relationship to customer loyalty?  One tool is to capture satisfaction ratings of specific service attributes and determine their correlation to the loyalty statistic.  The Pearson correlation coefficient is a measure of the strength of a linear association between two variables.

The following table contains a hypothetical list of service attributes and their correlation to the loyalty index.  Note lower values of the loyalty index indicate stronger loyalty, so the Pearson correlations to the attribute satisfaction ratings are negative.  The closer the correlation is to -1 equates to a stronger relationship to loyalty.

Pearson Correlation to Loyalty Index
Perform services as promised/right the first time -0.62
Show interest in solving problems -0.61
Employee efficiency -0.58
Problems resolved quickly -0.56
Employee courtesy -0.56
Willingness to help/answer questions -0.55
Perform services on time -0.54
Employee recommendations -0.53
Employees instill confidence in customer -0.52
Questioning to understand needs -0.45
Appearance/cleanliness of personnel -0.42
Knowledgeable employees/job knowledge -0.41
Appearance/cleanliness of physical facilities -0.37

As this table illustrates, the service attributes with the strongest correlation to the loyalty index are: perform services as promised/right the first time (-0.62), show interest in solving problems (-0.61), and employee efficiency (-0.58).  Under this hypothetical example, the hypothetical managers can conclude that of the attributes measured, these three are the strongest drivers of customer loyalty.  They now can use this research to make informed judgments as to where investments in the service mix will yield the most ROI.

Correlating service attributes to loyalty is not the end of the analysis; the next step is to further put this research to action by layering in the overall performance of each attribute relative to its relationship to loyalty.

Next Article: Using Gap Analysis to Put Loyalty Index into Action

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Using Promoter and Trust Measurements to Calculate a Customer Loyalty Index

Research has determined the business attribute with the highest correlation to profitability is customer loyalty.  Customer loyalty lowers sales and acquisition costs per customer by amortizing these costs across a longer lifetime – leading to some extraordinary financial results.  Depending on the industry, a small increase in customer loyalty (5%) translates into a 25% – 85% increase in profits.[1]

Customer loyalty is driven by the entire relationship with the company.  Image, positioning, products, price, cost of switching, and service all form a value equation each customer applies in their continuous decision to remain loyal.

Measuring customer loyalty, however, in the context of a survey is difficult.   Surveys best measure attitudes and perceptions. Loyalty is a behavior based on rational decisions customers make continually through the lifecycle of their relationship with the company.  Customer experience researchers therefore need to find a proxy measurement to determine customer loyalty.  One might measure customer tenure under the assumption that length of relationship predicts loyalty.  However, customer tenure is a poor proxy.  A customer with a long tenure may leave the firm, or a new customer may be very satisfied and highly loyal.

Kinesis has had success with a model for estimating customer loyalty based on two measurements: likelihood of referral and customer advocacy.  Likelihood of referral captures a measurement of the customer’s likelihood to refer the company to a friend, relative or colleague.  It stands to reason, if one is going to refer others to the bank, they will remain loyal as well.  These promoters are putting their reputational risk on the line founded on a feeling of loyalty and trust.  This concept of trust is perhaps more evident in the second measurement: customer advocacy.  Customer advocacy is captured by measuring agreement with the following statement: “The Company cares about me, not just the bottom line.”  Customers who agree with this statement trust the firm to do right by them, and will not subjugate their best interests to profits.  Customers who trust the company to do the right thing are more likely to remain loyal.   Trust Promoter Plot

Kinesis uses likelihood of referral, hereafter labeled “Promoter” and customer advocacy, hereafter labeled “Trust” to calculate an estimate of the customer’s loyalty.  Imagine a plot where each customer’s promoter score is plotted along one axis and the trust score plotted along the other.  Using this plot we can calculate the linear distance between the perfect state of the highest possible trust and promoter ratings.  This distance yields a loyalty estimate, where the lower the value, the higher the estimate of loyalty – low values are good.  The mathematical equation for this distance is as follows:

 Loyalty Index Equation


  • T = Trust rating
  • P = Promoter rating
  • ST = Number of points on the Trust scale
  • SP = Number of points on the Promoter scale
 Kinesis’ experience plotting these indices, across a variety of scales, typically yields five zones of loyalty defined as follows:Loyalty Ranges
  1. Strongest Loyalty: The strongest zone of loyalty contains cases where both the Trust and Promoter attributes received the highest possible rating.
  2. Strong Loyalty: The next zone is where the loyalty index lies within 35% of both the Trust and Loyalty axis.
  3. Moderate Loyalty: The zone of moderate loyalty is where the index lies within 60% of the highest possible Trust and Promoter ratings.
  4. Weak Loyalty: The zone of weak loyalty lies within 90% of the highest possible Trust and Promoter ratings.
  5. Weakest Loyalty: The zone with the weakest loyalty are cases where one or both of the Trust and Promoter scores are less than 90% of the highest possible for Trust and Promoter..

Given that for many industries the business attribute with the highest correlation to profitability is customer loyalty; it is incumbent upon survey researchers to gather a measure of customer loyalty as part of their customer experience measurement.  Kinesis’ approach of calculating a loyalty index based on “would recommend” and “customer advocacy” ratings has proven to be a useful tool for segmenting customers by an estimate of their loyalty.  The next step in this analysis is to put this segmentation to work identifying which service attributes will yield the most ROI in term of driving customer loyalty.

Next Article: Using Gap Analysis to Put Loyalty Index into Action

[1] Heskett, Sasser, and Schlesinger The Service Profit Chain, 1997, New York: The Free Press, p 21

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Call to Action: Using Gap Analysis to Put Loyalty Index into Action

For most service industries the business attribute with the highest correlation to profitability is customer loyalty. It is, therefore, very important to gather a measurement of customer loyalty. However, simply calculating a loyalty index is not enough. Estimating customer loyalty is important, and an obvious first step; however, alone – without any context – is not very useful.

What’s needed is a methodology to transition research into action, and identify clear paths to maximize return on investments in the customer experience. What managers need is a tool to help them prioritize the service behaviors on which to focus improvement efforts. One such tool is an analytical technique called Gap Analysis.

Gap Analysis compares performance of individual service attributes relative to their importance, providing a frame of reference for prioritizing which areas require attention and resources.

To perform Gap Analysis, each service attribute measured is plotted across two axes. The first axis is the performance axis. On this axis the performance of each attribute is plotted. The second axis is the importance axis. Each attribute is assigned an importance rating based on its correlation to the loyalty index. Service attributes with strong correlations to loyalty are deemed more important and service attributes with low correlations are deemed less important.

This two-axis plot creates four quadrants:

Gap Analysis Loyalty

  1. Quadrant 1: Areas with high correlations to loyalty and low performance.  These service attributes are where there is high potential of realizing return on investments in improving performance.
  2. Quadrant 2: Areas with high correlations to loyalty and high performance.  These are service attributes to maintain.
  3. Quadrant 3: Areas with low correlations to loyalty and low performance.  These are service attributes to address if resources are available.
  4. Quadrant 4: Areas with low correlations to loyalty and high performance.  These are service attributes which require no real attention as their performance exceeds their importance.

To illustrate this analysis methodology, consider the example below with the following service attributes:


Loyalty Correlation

Appearance/cleanliness of physical facilities



Appearance/cleanliness of personnel



Perform services as promised/right the first time



Perform services on time



Show interest in solving problems



Willingness to help/answer questions



Problems resolved quickly



Knowledgeable employees/job knowledge



Employees instill confidence in customer



Employee efficiency



Employee courtesy



Employee recommendations



Questioning to understand needs



Plotted on the above quadrant chart, they yield the following chart:

Gap Example

In this example, problems resolved quickly, employee efficiency, willingness to help, employees instill confidence are the four behaviors with relatively high correlations to the loyalty index and relatively low performance  As a result, improvements in these attributes will yield the highest potential for ROI in terms of improving customer loyalty.

Using gap analysis, managers now have a valuable indicator to identify service attributes to focus improvement efforts on.  Directing attention to the attributes in Quadrant I should have the highest likelihood realizing ROI in terms of the customer experience improving purchase intent.

Related Article: Using Promoter and Trust Measurements to Calculate a Customer Loyalty Index

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Return On Investment: Quantify the return when forming a service strategy. Is good service a good thing?

Author: Peter Gurney

Reprinted from the Puget Sound Business Journal

October 5, 2001

Most business people would say it is. It keeps customers coming back, they will claim. And it could lead to more frequent purchases, fewer complaints, positive word-of-mouth and other activities that affect profitability. But if you ask how much they should invest in good service and how much return they can expect from their investment, the answers start to get fuzzy.

Most business people don’t know what their return on investment, or ROI, in customer service is, even what it should be. Nevertheless, they spend money – sometimes an astonishing amount – on employee training, customer satisfaction research, mystery shopping and manager incentives with the belief that it will pay off in the end.

This is a good time to evaluate customer service expenditures and determine how to maximize investments.

So often business professionals give little scrutiny to customer service expenditures, which tend to be based not on calculated benefit, but on blind faith.

This approach begins with the unchallenged belief that good service always leads to higher profits. Companies launch service crusades, making grand promises to their customers as they whip their staff into a frenzy of friendly service activity. They intone ritual phrases, like, “We’re dedicated to excellence,” and “The customer is No. 1.” They proclaim they will become the Nordstrom of their industry. And they contribute a substantial amount of money to the effort, confident it is going to a good cause.

In the end, the miracle they had hoped for seldom appears. Customers may be more satisfied, but the desired rise in profitability rarely occurs. There may be profit changes, up or down, but it is devilishly difficult to figure out how much effect service quality had on the change.

At this point many companies experience a crisis in faith and revert to their old practices: cost cutting, reductions in staff and new ad campaigns. Poorer but wiser, they look back at their crusade and wonder how they could have been so naive.

Despite efforts of so many companies to improve service, customer satisfaction levels have been dropping nationwide for years. In fact, the American Customer Satisfaction Index, a cross-industry national economic indicator of customer satisfaction, reports that 38 industries polled show a steady decline since 1994.

Perhaps it is time to take a different approach, beginning by redefining what makes service good or bad.

Here is a suggestion. Good service should begin and end with profit. If there is no predictable, measurable ROI, it isn’t good for anybody in the long run. Investors get a suboptimal return, employees suffer through service crusades doomed to failure, and customers are set up with unrealistic expectations that companies cannot meet.

The newest approach to customer service is a holistic one – Customer Experience Management – better known as CEM. It’s a profit-based approach to service beginning with companies asking the question, “What do we want our customers to do more of or less of?”

Do we want them to spend more with each purchase? To complain less frequently? To recruit new customers through word-of-mouth? In making this list, attitudes (such as satisfaction) and feelings (such as delight) are not included – only measurable, observable customer behaviors that can plausibly be influenced through service interactions.

The next step in this exercise is to calculate the financial effect of an incremental change in each customer behavior. What would be the effect on revenue of increasing the average customer purchase by one dollar, or reducing the volume of complaints to call centers by five percentage points? It quickly becomes clear even a small change in some customer behaviors can have a substantial financial impact.

This process next moves to the subject of employee training. What specific knowledge and skills are needed to influence desired customer behaviors? Then, you need to ask what rewards will be most effective at reinforcing the use of those skills? What metrics need to be gathered to trigger rewards?

With this process, there is always a clear path to making money. All of those fuzzy, feel-good terms that so many businesses base their service initiatives on, like “customer loyalty” and “customer delight,” are left to the public relations companies. This doesn’t mean there is no benefit to customers. On the contrary, the types of behaviors desired of customers will only come about if they are satisfied, loyal and occasionally delighted. But companies cannot make the world a better place for customers unless they show a profit. By defining good service in terms of its effect on the bottom line, everybody wins.

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Include Service in Your Business Plan

Author: Peter Gurney

Reprinted from Northwest Entrepreneur Network

March, 2002

Think about the organizations that stand out as leaders in customer service – companies like Southwest Airlines, Federal Express and Nordstrom. Now, contrast these companies with the parade of mediocre service providers we encounter every day as customers: the restaurant chains and retail stores, and the telecommunications companies that perpetually annoy us with long waits, uninformed personnel and self-serving policies (can you spell “Qwest”?). What the first group of companies has in common is that they planned for service excellence from the beginning. Good service is not something they tried to introduce after they were up and running; it is part of their DNA, an essential component of their business model.

These service leaders offer a valuable lesson for entrepreneurs. Business plans typically include details about how to attract customers, but little information about how to sustain and build relationships after acquisition. They often include platitudes like, “We are a customer-centric organization,” and “We create value for all of our stakeholders,” but seldom present a clear strategy that shows how customers will be retained, nurtured and made progressively more profitable over time.

There are many financial benefits to articulating and following a strategy of service excellence: lower customer and employee turnover, fewer complaints and returns, greater share of wallet, positive word-of-mouth endorsements. But good service costs money, and it is easy to invest in service standards and programs that do not provide a measurable return. The key is to form a clear strategy that links service investments with profit-based outcomes, and to make sure the service strategy aligns with other components of the business model.

Young companies with no formal service strategy frequently give the appearance of being “customer-centric” – first, because there aren’t many customers, and second, because the internal service providers tend to be owners or others who are heavily invested in the organization’s success. Over time, however, the responsibility for customer relationships will devolve to employees who are less invested and less empowered to take risks, solve problems and spend money on solutions. At this point a formal service strategy acts as a roadmap to keep the company true to its vision.

At the least, the service strategy should indicate how customers will be retained after acquisition. Many of the now-defunct dot-coms failed in part because they neglected to think through a retention approach after spending millions on attracting customers. Other companies suffer from chronic customer churn and low profitability because they have not aligned customer expectations with service delivery.

A retention strategy begins with an understanding of the typical customer’s lifecycle with the company. It identifies the points at which the customer and company interact, when and how often those interactions are likely to occur, and how they can best be used to advance the customer relationship.

In the book “The Loyalty Effect”, author Frederick Reichheld makes the case that the longer customers remain with a company, the more profitable they become. The loyalty effect works because long-term customers have more opportunities to learn about the company (and vice versa), allowing the relationship to become increasingly efficient and productive. But the benefits of loyalty do not occur simply because customers have more experiences with the company over time. To move up the loyalty/profit curve they need to have the types of experiences that will add to their knowledge and influence their behavior. Understanding the customer lifecycle allows the company to plan the right types of customer experiences at the right time.

Implementation decisions follow logically from the service strategy. By identifying when and how interactions occur, as well as what they should accomplish (both for the customer and the company), one can work backwards to design a service-focused organization. The service strategy helps define appropriate standards and policies, and also suggests how standards and policies can be supported through hiring practices, training content, research and measurement, business tools, etc.

Consider research and measurement. Many companies make a substantial investment in customer surveys, call monitoring, mystery shopping and other service-related research that generates reams of data reports — which sit, unread and unused, on the desks of overworked managers. But with a clearly articulated service strategy that is incorporated into the business model, companies can make much better decisions from the first about what data they should collect and how they should use it. For example, by mapping out the points at which service failures are most likely to occur, the company can create feedback channels that will identify at-risk customers, and service recovery mechanisms to prevent turnover. The service strategy will also suggest what data should be captured to ensure that standards are executed properly and that employees and managers are rewarded for the right outcomes.

Choices of business tools and systems also follow from the service strategy. Consider that in the past few years billions of dollars have been spent on Customer Relationship Management (CRM) systems that have under-performed or failed to produce a positive return. One of the primary reasons for this failure is that many systems were installed with no logical context: companies invested in improving customer relationships without defining what an ideal customer relationship should look like. A clear service strategy fills that void, allowing the company to invest in tools and systems that support a well-defined vision.

All of these details do not necessarily go into the business plan – they may go into the plan behind the plan, or emerge over time as the company evolves. What does go into the business plan is a declaration of the role that service will play in the overall offering of the company, and a description of how the service strategy will align with other components of the organization. Also included is a picture of what the relationship between the company and customer should look like as it advances through the customer lifecycle. Armed with this information, new companies can make service work for them from the outset.

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