The Hourglass Model is a conceptual framework in network and systems engineering that illustrates the evolution of networks and systems from a complex and diverse structure to a standardized and simplified one, and then back to a complex structure. It is named after its hourglass shape, which represents this transformation process. ![[HourglassModel_DevOps_Cone_Bowtie.png|800px]] At the top of the hourglass, there is a wide range of applications, protocols, and devices that exist in a heterogeneous environment. This diversity allows for flexibility and innovation but can also result in complexity and inefficiency. Moving down the hourglass, there is a narrow waist that represents a standardized layer or protocol that acts as an interface between the upper and lower layers. This standardized layer is often referred to as the "waist of the hourglass" or the "common denominator." It enables [[interoperability]] and simplifies communication between different components in the network or system. This standardization facilitates compatibility, scalability, and ease of development. The bottom part of the hourglass widens again into a diverse set of underlying technologies, protocols, or devices. This diversity enables customization according to specific needs or requirements. The Hourglass Model relates to the notion of [[Funnel|funnelling]] by representing how networks and systems evolve from complexity to simplicity (funneling through standardization) before expanding again into complexity (diversification). The model suggests that as technology advances, it tends to become more standardized at certain layers to enable widespread adoption and collaboration. This standardization serves as a funneling mechanism that simplifies communication between different components. However, it is important to note that while funneling through standardization brings benefits such as compatibility and scalability, it can also limit innovation or hinder customization. Therefore, striking a balance between standardization (funnelling) and diversification is crucial for network and systems engineering to accommodate both common requirements and specific needs. # Hourglass Model and ABC curriculum [[Micah Beck]]'s paper on the Hourglass Model provides an insightful perspective on the structure and functioning of complex systems. The Hourglass Model is characterized by a wide top and bottom with a narrow waist in the middle. This structure can be applied to various systems, including technological, biological, and organizational ones. Let's explore why a narrow waist is critical in such systems and how it relates to the argument about why ABC curriculum must be organized in a way similar to the hourglass model that are commonly associated with Software Defined Network. 1. **Central Point of Control and Coordination**: The narrow waist in a complex system acts as a central point of control and coordination. This centralized control is crucial for maintaining the stability and efficiency of the system. In the context of the [[ABC curriculum]], emphasizing the Hourglass Model could mean focusing on core principles or foundational knowledge that governs a wider range of specialized topics. 2. **Standardization and Interoperability**: The narrow waist often represents a standard or a set of protocols that ensure interoperability among the diverse components of the system. In technology, for example, TCP/IP in the Internet Hourglass Model ensures that devices with varied hardware and software can communicate effectively. In an educational curriculum, a set of core standards or competencies could serve a similar purpose, ensuring that diverse educational modules or subjects are interconnected through a common framework. 3. **Facilitation of Evolution and Innovation**: While the narrow waist provides stability and standardization, the wide top and bottom of the hourglass allow for diversity and innovation. This structure supports the evolution of the system without necessitating changes to the central standard. In an educational setting, this could translate to the ability to constantly update and add new content and teaching methods while maintaining a stable core curriculum. 4. **Efficiency in Complexity Management**: A narrow waist simplifies the management of complex systems by reducing the number of interactions that need to be directly managed. In an educational context, having a focused set of core principles or skills could make it easier for students and educators to navigate the complexity of a comprehensive curriculum. 5. **Reduction of Redundancy and Conflict**: The centralized model of the hourglass reduces redundancy and potential conflicts among components. In a curriculum, this would mean that having a unified core reduces the likelihood of contradictory teachings or overlapping content across different subjects or courses. 6. **Scalability and Flexibility**: The hourglass model, due to its centralized control mechanism, allows for scalability and flexibility. The system can grow and adapt without losing its coherence, a feature that is vital in the ever-evolving field of education. In conclusion, elevating the Hourglass Model in the [[ABC curriculum]] would mean emphasizing a central set of principles or standards that govern the wider, more diverse aspects of the curriculum. This approach can provide stability, interoperability, and a framework for innovation, making the system more robust, manageable, and adaptable. # References ```dataview Table title as Title, authors as Authors where contains(title, "Hourglass") or contains(subject, "Hourglass") ```