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Tetraclass Model
(Llosa Matrix)

Overview
Creator	Sylvie Llosa
Year of design	1996
Field	Marketing / Customer relationship management (CRM)
Objective	Customer satisfaction analysis
Discipline	Management sciences
Institution	Aix-Marseille III
Key components
Driving elements	"Plus" and "Key" elements
Passive elements	"Basic" and "Secondary" elements

The Llosa Tetraclass Model, also known as Tetraclass Analysis or the Llosa Matrix, is a customer satisfaction analysis tool developed in 1996 by French researcher Sylvie Llosa [fr] as part of her doctoral thesis in management sciences^[1]. It classifies the various elements of a service according to their influence on customer satisfaction and dissatisfaction, distinguishing four categories: "Plus", "Key", "Basic", and "Secondary" elements.^[2][3]

The model is used in marketing, service quality management, and satisfaction research to identify priority areas for improvement and factors contributing to excellence in an offering.^[2][4]

The Tetraclass Model was proposed by Sylvie Llosa in the late 1990s, in a context where traditional customer satisfaction models, particularly linear compensatory approaches, were showing limitations in explaining the complexity of consumer judgements.^[2][3]

Llosa's work belongs to a research tradition which considers that the contribution of an element to overall satisfaction may vary depending on whether that element is perceived positively or negatively.^[2][3] The model was subsequently disseminated and operationalised through survey and analysis software, such as the Sphinx suite, and adopted in numerous applied studies in tourism, services, banking, healthcare, and other fields.^[3][4][5]

The Tetraclass Model aims to:^[2][3]

• identify, among the evaluation criteria of a service experience, those which:
  • primarily generate satisfaction,
  • primarily generate dissatisfaction,
  • have a strong effect in both directions,
  • or have little influence;
• help organisations prioritise their actions: where to invest in order to improve overall satisfaction, and which elements are already sufficient or secondary^[2].

The model generally relies on:^[2][3]

• a satisfaction survey including:
  • a measure of overall satisfaction,
  • partial satisfaction ratings for each criterion (e.g. reception, waiting time, price, cleanliness, competence, etc.);
• a multivariate analysis, often a correspondence analysis, which examines the contributions of each criterion to satisfaction and its contributions to dissatisfaction^[2].

Based on the analysis, each criterion is positioned in one of the four quadrants of the model.^[2][3]

• These elements contribute strongly to satisfaction when they are perceived positively.
• Conversely, when they are perceived negatively, they do not result in strong dissatisfaction.
• They correspond to differentiating strengths or appreciated "extras", but are not essential^[2][3].

Example: a high-end concierge service in a hotel: its absence may not necessarily cause dissatisfaction, but its presence is highly valued.

• These criteria have a strong influence in both directions:
  • when perceived positively, they strongly increase satisfaction,
  • when perceived negatively, they strongly increase dissatisfaction.
• They are considered strategic levers for the organisation^[2][3].

Example: the quality of service in a restaurant, or the speed at which a complaint is handled.

• These elements strongly contribute to dissatisfaction when they are perceived negatively.
• However, when they are perceived positively, they only slightly improve satisfaction.
• They correspond to basic expectations that customers consider normal or taken for granted^[2][3].

Example: cleanliness of a hotel room, safety in transport, or compliance with stated delivery times.

• These criteria have little influence whether they are perceived positively or negatively.
• They have only a limited impact on overall satisfaction.
• They may be considered neutral or relatively insignificant factors in the overall judgement^[2][3].

Example: certain decorative details, secondary information on a website, or very marginal aspects of a service.

In the vehicle rental sector, the "Tétraclasse" model provides a structured framework for prioritizing service quality criteria based on their actual contribution to overall customer satisfaction. "Basic" elements, such as vehicle cleanliness, the provision of the specific model reserved, and adherence to scheduled availability times, constitute essential prerequisites: their absence triggers immediate and significant dissatisfaction, yet their presence is viewed as the norm and generates no additional satisfaction. "Key" elements, such as billing transparency and vehicle mechanical reliability, influence both ends of the satisfaction spectrum and warrant priority attention. Conversely, factors like flexible return times, the quality of the branch welcome, or personalized add-on services often act as "plus" elements capable of creating distinctive satisfaction without their absence being detrimental. Finally, certain criteria, such as the branch's interior décor, fall into the category of "secondary" elements, with a marginal impact on overall satisfaction in either direction. This mapping enables operators to focus their resources on the levers that drive significant real-world impact.

The conventional implementation of the Tetraclass Model involves several steps: ^[2][3][6][7]

Survey design: definition of the service evaluation criteria; measurement of overall satisfaction and partial satisfaction for each criterion.

Data collection: administration of the questionnaire to a representative sample of customers or users.

Statistical analysis: conducting a correspondence analysis or another multivariate analysis; construction of a Tetraclass map in which each criterion is positioned according to its influence on satisfaction and dissatisfaction^[2].

Managerial interpretation: identification of Key criteria (to be improved as a priority), Basic criteria (to be secured), Plus criteria (to be enhanced), and Secondary criteria (to be monitored without strong priority); development of an appropriate action plan^[4].

Llosa's Tetraclass Model is used in numerous sectors^[3][4]

• Tourism and hospitality: analysis of customer satisfaction with hotels, restaurants, and tourist attractions^[3][8].
• Financial services: evaluation of customer relationships in banking and insurance.
• Healthcare: patient satisfaction with care, reception, and information^[9][10][11].
• Retail: satisfaction with shopping centres^[12][13].
• Public services: perceived quality of administrative services, transport services, and others^[14][15].

It is also frequently integrated into survey research software, such as Sphinx, which provides modules dedicated to Tetraclass analysis^[5].

The primary contribution of the Tetraclass model lies in its non-linear conceptualization of satisfaction: unlike traditional approaches (Expectation confirmation theory, SERVQUAL, compensatory multi-attribute models (Martin Fishbein, 1963)), it recognizes that a single criterion can yield asymmetric effects depending on whether it is perceived positively or negatively.^[2][3] This distinction makes it possible to move beyond simple satisfaction averages to reveal the true drivers of overall satisfaction.^[4] The model thus serves as an operational tool that organizations can directly utilize, providing a structured basis for prioritizing improvement initiatives and focusing resources on the highest-impact criteria.

Implementing the model requires rich data—combining overall and partial assessments—as well as a sufficiently large sample. Its reliability depends heavily on the quality of the questionnaire and the relevance of the selected criteria. Finally, the interpretation of the quadrants is not universal; it can vary significantly depending on the business sector, cultural context, and respondent profile.^[3]

The Kano model and the Tetraclass model share a common goal:^[16] to move beyond the linear view of satisfaction, which posits that the greater the presence of an attribute, the higher the customer satisfaction.^[2] However, their approaches differ significantly; Kano classifies attributes into five categories: basic, performance, attractive, indifferent, and reverse. Based on a bipolar questionnaire assessing reactions to the presence or absence of an element, thereby remaining more focused on product design and innovation.^[17] The Tetraclass model, developed by Sylvie Llosa in 1997, is distinguished by its specific application to the service sector: it plots two axes—contribution to satisfaction and contribution to dissatisfaction.^[1] Its unique feature is that a single attribute can strongly contribute to satisfaction without causing dissatisfaction when absent, thereby challenging the symmetry assumed by other models[5] ^[18]and making it a highly practical tool for service managers.

• Customer satisfaction
• Service quality
• Kano model
• Correspondence analysis

• Sylvie Llosa's doctoral thesis page on the Theses.fr portal: Contributions à l'étude de la satisfaction dans les services
• Presentation of the Llosa Matrix by Le Sphinx: Matrice Llosa : mieux comprendre la satisfaction