Understanding Saracevic's Stratified Model (1997) in User-Computer Dialogue

Tefko Saracevic's Stratified Model, particularly the 1997 version, provides a framework for understanding the complex process of interaction, especially in the context of information retrieval and user-computer dialogue. This model breaks down the interaction into several strata or levels, looking at it from both the user's (human) side and the system's side.

The question asks specifically about the strata represented from the human side in the context of dialogue between a user and computer through an interface according to this model.

Saracevic's Model: Strata Explained

Saracevic's model typically considers different levels or strata involved in the interaction. These levels can be broadly categorized, though specific terminology might vary slightly across different presentations of the model:

• System Side Strata: These relate to how the information system or computer interface functions. This often includes aspects like content representation, processing of queries, system architecture, interface design, etc.
• Human Side Strata: These relate to the user's internal state and external context during the interaction.
• Interaction Strata: These relate to the dynamics and processes occurring during the dialogue between the user and the system, such as matching queries to content, feedback loops, negotiation of meaning, etc.

Focusing on the Human Side Strata

According to Saracevic's model, the human side involves several key levels that influence how a user interacts with and makes sense of information presented by the computer interface. The important strata from the human perspective include:

• Cognitive Strata (C): This level deals with the user's mental processes. It includes how the user understands the information need, formulates queries, interprets the results, understands the interface, makes decisions, and learns during the interaction. It's about the user's knowledge, beliefs, information processing capabilities, and cognitive state.
• Affective Strata (D): This level concerns the user's emotional state, feelings, attitudes, and motivations during the interaction. It includes aspects like satisfaction, frustration, interest, confidence, anxiety, and perceived usefulness. The user's affective state significantly impacts their behavior and persistence in the dialogue.
• Situational Strata (E): This level considers the context surrounding the interaction. This includes the user's task or goal, the physical environment, the social context (if any), time constraints, and other external factors that influence the user's need and approach to the interaction. The situation shapes the relevance and utility of the information or dialogue.

Analyzing the Options

Let's look at the strata listed in the options and determine if they belong to the human side:

• A. Content levels: This typically refers to the nature and structure of the information or data within the system, belonging to the system or interaction side.
• B. Processing: This generally refers to how the system processes queries, data, or algorithms, belonging to the system side.
• C. Cognitive: This relates to the user's mental processes, belonging to the human side.
• D. Affective: This relates to the user's emotional state, belonging to the human side.
• E. Situational: This relates to the user's context and external factors, belonging to the human side.

The question asks for the strata represented from the human side. Based on our analysis of Saracevic's model, the human side comprises the Cognitive, Affective, and Situational strata.

Let's evaluate the given options:

• Option 1: A, B and C only (Content, Processing, Cognitive). Incorrect, as Content and Processing are system-side.
• Option 2: B, C and D only (Processing, Cognitive, Affective). Incorrect, as Processing is system-side.
• Option 3: B, D and E only (Processing, Affective, Situational). Incorrect, as Processing is system-side.
• Option 4: C, D and E only (Cognitive, Affective, Situational). Correct, as all three are considered human-side strata in Saracevic's model.

Therefore, the strata representing the human side in Tefko Saracevic's Stratified Model (1997) are Cognitive, Affective, and Situational.

Revision Table: Saracevic's Model Strata

Additional Information: Significance of Human Side Strata

Understanding the human side strata (Cognitive, Affective, Situational) is crucial in designing effective user-computer interfaces and dialogue systems. By considering these factors, designers and developers can create systems that are not only functional but also usable, satisfying, and relevant to the user's specific needs and context. For instance:

• Considering the Cognitive strata helps in designing interfaces that align with how users think, process information, and solve problems, reducing cognitive load.
• Understanding the Affective strata allows for the design of systems that manage user frustration, build trust, and enhance user satisfaction and engagement.
• Accounting for the Situational strata ensures that the system provides relevant support within the user's specific task, environment, and constraints, making the interaction more effective and appropriate.

Saracevic's model highlights that successful user-computer interaction is not just about the system's capabilities but also deeply involves the user's internal state and external situation.