Systems thinking and systems analysis

How is systems engineering defined by NASA?

Systems engineering is a methodical, interdisciplinary approach to designing, managing, and evaluating systems across their lifecycle.

What are 3 key values of systems thinking?

1. Understanding interactions and integration, not just components

2. Managing complexity through coordination and trade-offs

3. Focusing on the 'big picture' and system-level performance

What 4 things does the systems engineer play a central role in?

1. Defining system architecture and boundaries t

2. Managing trade-offs and risks

3. Coordinating subsystems and stakeholders

4. Ensuring validation and alignment with goals

What is a system?

An interconnected set of elements organized to achieve a purpose.

What are 3 essential components of a system?

1. Elements: tangible or intangible parts

2. Interconnections: relationships, flows, or information links between elements

3. Purpose (function): the overall goal or behavior of the system

What are 5 characteristics that distinguish systems from simple collections?

1. Completeness: all parts are necessary for proper functioning

2. Structured organization: parts must be arranged in specific ways to achieve purpose

3. Embeddedness: systems exist within larger systems and serve broader roles

4. Stability through adjustment: systems maintain equilibrium via internal adjustments

5. Feedback dependence: feedback loops regulate behavior and enable adaptation

What are the 3 levels of understanding? Give a short description for each level.

1. Events (surface levels): Observable, immediate occurrences that often lead to reactive, short-term solutions.

2. Patterns (trends over time): Repeated behaviors or trends that provide context and predictive insight.

3. Structure (deep level): Underlying relationships and rules that are the true source of system behavior.

What are linear systems?

Linear systems are based on additivity (effects sum up), proportionality (output scales with input), and are simple, intuitive, and easy to model.

What are non-linear systems?

Non-linear systems are characterized by interactions, feedback, and emergence, where small changes can produce disproportionate effects, resulting in unpredictable and complex behavior.

How to estimate the doubling time during exponential growth?

Divide 70 by the constant growth percentage.

Explain analysis.

Reductionism that breaks systems into parts, studies components in isolation, and assumes the whole equals the sum of its parts. Works well for simple systems.

Explain synthesis.

System thinking that focuses on relationships and context, understanding parts through their role in the whole, emphasizing interdependence and complexity. Works best for complex systems.

What are 4 differences between synthesis and analysis?

• Synthesis: Holistic, focuses on relationships, non-linear causation, context-driven.

• Analysis: Fragmented, focuses on parts, linear causation, isolation driven.