Search results for: Alejandro Salado

Items from 1 to 20 out of 32 results

article

Interpreting integrability

Alejandro Salado

Most systems engineers have likely heard of or pursued integrability when developing systems. It is also likely that systems engineers perceive that, in general, integrability is a desired quality to attain. But what is integrability, really? While there is likely a consensus within the systems engineering community about the general idea of integrability, this paper poses that reasoning about integrability...

article

Optimal verification strategy for general development plans using a belief‐based approach

Aditya U. Kulkarni, Ashley Girod, Peng Xu, Alejandro Salado

Systems Engineering > 27 > 1 > 74 - 98

Verification activities are intended to reduce the costs of system development by identifying design errors before deploying the system. However, subcontractors in multi‐firm projects are motivated to implement locally cost‐effective verification strategies over verification strategies that benefit the main contractor. Incentivizing verification activities is one mechanism by which the contractor...

article

MBSE adoption experiences in organizations: Lessons learned

Kaitlin Henderson, Thomas McDermott, Alejandro Salado

Systems Engineering > 27 > 1 > 214 - 239

Lessons learned through MBSE adoption efforts is one of the key ways of communicating best practices and recommendations for MBSE. This study compiles lessons learned from published case studies and practitioner interviews. Lessons are summarized into categories such as adoption strategy, modeling practices, and communication. This paper provides a source for future adopters of MBSE to review best...

article

Towards Developing Metrics to Evaluate Digital Engineering

Kaitlin Henderson, Tom McDermott, Eileen Van Aken, Alejandro Salado

Systems Engineering > 26 > 1 > 3 - 31

Model‐based systems engineering (MBSE) is an increasingly accepted practice in the Systems Engineering (SE) community, however, little has been done to empirically show that MBSE provides value. Furthermore, as the industry continues in the direction of digital transformation, MBSE will become a critical component of the larger Digital Engineering (DE) approach. This paper presents a measurement framework...

article

An experimentation framework for validating architectural properties as proxies for the ilities

Alejandro Salado

Systems Engineering > 25 > 4 > 342 - 359

Desired system ilities, understood as lifecycle properties, generally drive the value of a system's architecture. However, ilities are hard to predict during system architecture development before the architecture has been instantiated with a system design. In this paper, an experimentation framework that can be employed to validate the adequacy of using architectural properties as proxies for ilities...

article

Optimal verification strategies in multi‐firm projects

Aditya U. Kulkarni, Alejandro Salado, Christian Wernz

Systems Engineering > 25 > 3 > 254 - 270

Verification activities are intended to reduce the costs of system development by identifying design errors before deploying the system. However, subcontractors in multifirm projects are motivated to implement locally cost‐effective verification strategies over verification strategies that benefit the main contractor. Incentivizing verification activities is one mechanism by which the contractor can...

article

Modeling correction activities in the context of verification strategies

Peng Xu, Alejandro Salado

Systems Engineering > 25 > 2 > 173 - 188

Correction activities (CAs), which can take the form of redesign, rework, or repair, are essential to system development. Whereas verification activities (VAs) provide information about the state of the system, CAs modify the state of the system to facilitate its correct operation. However, existing approaches to modeling and optimizing verification strategies take a simplistic approach to CAs. Specifically,...

article

A systems‐theoretic articulation of stakeholder needs and system requirements

Alejandro Salado

Systems Engineering > 24 > 2 > 83 - 99

The literature shows disparities in how fundamental systems engineering concepts in the area of requirements engineering, such as stakeholder needs, system requirements, requirements elicitation, requirements derivation, and requirements decomposition, are used within the communities‐of‐practice and in research. Such disparities can lead to conceptual and application inconsistencies, which have been...

article

An evaluation of the optimality of frequent verification for vertically integrated systems

Aditya U. Kulkarni, Alejandro Salado, Peng Xu, Christian Wernz

Systems Engineering > 24 > 1 > 17 - 33

Verification activities, such as inspection, testing, analysis, and demonstration, improve one's confidence in the system meeting the system requirements during the development process. Frequent verification is often advocated as a strategy that minimizes costs of rework over the entire design process, where frequent verification involves verifying after any change in the design. However, this strategy...

article

Value and benefits of model‐based systems engineering (MBSE): Evidence from the literature

Kaitlin Henderson, Alejandro Salado

Systems Engineering > 24 > 1 > 51 - 66

Traditional document‐based practices in systems engineering are being transitioned to model‐based ones. Adoption of model‐based systems engineering (MBSE) continues to grow in industry and government, and MBSE continues to be a major research theme in the systems engineering community. In fact, MBSE remains a central element in the International Council on Systems Engineering (INCOSE)’s vision for...

article

A perspective on systems thinking, architecting, and art

Tom McDermott, Alejandro Salado

Systems Research and Behavioral Science > 36 > 5 > 648 - 655

Systems architecture has been considered as both an art and a science. The systems architect uses heuristics, stories, and models to communicate complex architectural concepts to stakeholders. Since the earliest times, master building architects have developed their skills broadly across the technical, business, and fine art domains. Why should engineering be different? Principles and practices of...

article

Elemental patterns of verification strategies

Alejandro Salado, Hanumanthrao Kannan

Systems Engineering > 22 > 5 > 370 - 388

This paper proposes a set of seven elemental patterns of verification strategies. These patterns can be useful in modeling verification strategies in a wide range of engineered systems. They form the building blocks under which any verification strategy can be modeled. The patterns lead to a fundamental understanding of the interplay between system parameters and verification activities, as well as...

article

Systems thinking and mathematical problem solving

Alejandro Salado, Ahsan Habib Chowdhury, Anderson Norton

School Science and Mathematics > 119 > 1 > 49 - 58

Problem solving lies at the core of engineering and remains central in school mathematics. Word problems are a traditional instructional mechanism for learning how to apply mathematics to solving problems. Word problems are formulated so that a student can identify data relevant to the question asked and choose a set of mathematical operations that leads to the answer. However, the complexity and...

article

A mathematical model of verification strategies

Alejandro Salado, Hanumanthrao Kannan

Systems Engineering > 21 > 6 > 593 - 608

The field of systems engineering has recently experienced a new push for unveiling its scientific foundations and using them to inform better practice. The majority of the research effort towards a theory of systems engineering has concentrated on the early phases of the system's lifecycle, especially in the areas of problem formulation and system architecture and design. However, and despite their...

article

Conceptualization of a T‐Shaped engineering competency model in collaborative organizational settings: Problem and status in the Spanish aircraft industry

Bernardo A. Delicado, Alejandro Salado, Rafael Mompó

Systems Engineering > 21 > 6 > 534 - 554

There are persistent factors associated with ineffective systems engineering practice inherent in interdisciplinary teams. In this context, technical silos seem to be prevalent. The concept of team‐based competencies emerges as a paradigm to facilitate effective collaborative interactions between technical specialists during a system's development. In particular, the T‐Shaped competency model, while...

article

The Tension Matrix and the Concept of Elemental Decomposition: Improving Identification of Conflicting Requirements

Alejandro Salado, Roshanak Nilchiani

IEEE Systems Journal > 2017 > 11 > 4 > 2128 - 2139

Conventional approaches to system design use requirements as boundary conditions against which the design activity occurs. Decisions at a given level of the architecture decomposition can result in a flowing down of conflicting requirements, which are easy to fulfill in isolation but extremely difficult when dealt with simultaneously. Designing against such sets of requirements considerably limits...

article

Reducing Excess Requirements Through Orthogonal Categorizations During Problem Formulation: Results of a Factorial Experiment

Alejandro Salado, Roshanak Nilchiani

IEEE Transactions on Systems, Man, and Cybernetics: Systems > 2017 > 47 > 3 > 405 - 415

Problem formulation lays at the heart of systems engineering. While an over-constrained solution space may yield no satisficing solution affordably, properly defined solution spaces may enable developing solutions with high levels of affordability. Therefore, effective requirement elicitation from stakeholder needs is key to achieve a proper definition of the problem to be solved. Categorizing requirements...

article

Erratum to: A contribution to the scientific foundations of systems engineering: Solution spaces and requirements

Alejandro Salado, Roshanak Nilchiani, Dinesh Verma

Journal of Systems Science and Systems Engineering > 2017 > 26 > 5 > 590-592

The article A Contribution to the Scientific Foundations of Systems Engineering: Solution Spaces and Requirements written by Alejandro Salado, Roshanak Nilchiani and Dinesh Verma, has been revised due to a missing part the authors forgot to add. The missing part goes at the end of Appendix B, Page 36.

article

A contribution to the scientific foundations of systems engineering: Solution spaces and requirements

Alejandro Salado, Roshanak Nilchiani, Dinesh Verma

Journal of Systems Science and Systems Engineering > 2017 > 26 > 5 > 549-589

Some researchers have suggested that scientific foundations expressed in a mathematical form are needed to thrust the success of systems engineering as a discipline on its own merit. In order to contribute the development of such systems science, this paper investigates from a foundational standpoint the relationships between stakeholder needs, system requirements, and sets of systems. Various theorems...

chapter

Exile: A natural consequence of autonomy and belonging in systems-of-systems

Alejandro Salado

2016 Annual IEEE Systems Conference (SysCon) > 1 - 5

2016 Annual IEEE Systems Conference (SysCon)

Governance is one of the key differentiating elements between traditional systems and systems of systems. While systems are governed by a single authority, systems within a system of systems are often independently governed or governed by fully empowered entities. Such independence is a necessary condition for the autonomy of each constituent system and for enabling the concept of belonging. At the...

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INFONA - science communication portal

Search results for: Alejandro Salado

Interpreting integrability

Optimal verification strategy for general development plans using a belief‐based approach

MBSE adoption experiences in organizations: Lessons learned

Towards Developing Metrics to Evaluate Digital Engineering

An experimentation framework for validating architectural properties as proxies for the ilities

Optimal verification strategies in multi‐firm projects

Modeling correction activities in the context of verification strategies

A systems‐theoretic articulation of stakeholder needs and system requirements

An evaluation of the optimality of frequent verification for vertically integrated systems

Value and benefits of model‐based systems engineering (MBSE): Evidence from the literature

A perspective on systems thinking, architecting, and art

Elemental patterns of verification strategies

Systems thinking and mathematical problem solving

A mathematical model of verification strategies

Conceptualization of a T‐Shaped engineering competency model in collaborative organizational settings: Problem and status in the Spanish aircraft industry

The Tension Matrix and the Concept of Elemental Decomposition: Improving Identification of Conflicting Requirements

Reducing Excess Requirements Through Orthogonal Categorizations During Problem Formulation: Results of a Factorial Experiment

Erratum to: A contribution to the scientific foundations of systems engineering: Solution spaces and requirements

A contribution to the scientific foundations of systems engineering: Solution spaces and requirements

Exile: A natural consequence of autonomy and belonging in systems-of-systems

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