Sistemas de Informação - Aula 2 - Características de sistemas de informação

Introduction to Information Systems

Overview of the Course

• Professor Marcelo Fantinato introduces the course on information systems, focusing on their characteristics and purposes. The aim is to present foundational information related to these systems.

Purpose of Information Systems

• The lecture aims to explore why information systems exist and how they assist organizations in achieving their goals. It emphasizes that all types of organizations can benefit from these systems, not just traditional businesses.

Understanding Organizational Goals

Role of Information Systems

• Information systems are essential for helping organizations meet their business objectives, regardless of the type (e.g., private companies or NGOs). They serve as a support channel for achieving specific goals.

Broader Definition of Organizations

• The definition of an organization needing an information system extends beyond typical private entities; it includes any group with a common goal, such as non-profit organizations that also require support from these systems.

Examples and Applications

Varied Use Cases

• Examples illustrate diverse applications of information systems:

• Increasing sales for traditional businesses.

• Reducing material usage in manufacturing.

• Collecting taxes by governmental bodies.

• Ensuring safety in aviation operations.

• Improving educational processes within universities.

Characteristics of Information Systems

Complexity and Interdependence

• Information systems are characterized by high complexity due to multiple interrelated components (hardware, software) that are interdependent and non-linear in nature. This means outputs often depend on iterative interactions rather than straightforward input-output processes.

Evolutionary Nature

Understanding Database Hardware and Information Systems

Importance of Components in Information Systems

• The discussion emphasizes the interconnectedness and interdependence of various components within information systems, including hardware, databases, and networks.

• A visual representation illustrates how inputs (data) are processed into outputs (information and knowledge), highlighting the continuous feedback loop involved in this transformation.

Adaptability of Information Systems

• The adaptability of an information system is a key characteristic; while not all systems need to be adaptable, it is generally desirable for them to adjust to environmental changes.

• An adaptable system can change its operations based on shifts in its environment, whereas a non-adaptable system requires significant effort to modify when faced with such changes.

Emergent Properties in Complex Systems

• Emergence refers to behaviors that arise only when parts of a system integrate; this concept is crucial for understanding complex systems like information systems.

• Each component of an information system exhibits individual behavior but contributes to a greater collective behavior when integrated, which surpasses the sum of their isolated actions.

Integration Leading to Functionality

• The integration of components results in emergent properties; for example, human life as an emergent property arises from the interconnected functioning of bodily systems.

• In software development, individual components must work together effectively; without integration, functionalities cannot achieve their intended outcomes.

Examples of Emergent Properties

• Specific examples illustrate how functionalities like product sales depend on multiple integrated software components working together rather than functioning independently.

Usability and Reliability in Information Systems

Factors Influencing Usability

• The usability of a system is influenced by various factors, including the number of elements on the screen, operator training, and operational environment. It is not solely dependent on any single aspect.

• Reliability can be affected by unexpected interactions that lead to new types of failures. Integration issues may arise when different components are combined, which were not anticipated during development.

Emergent Properties and Non-Deterministic Behavior

• Emergent properties can negatively impact reliability; issues may surface only after integrating all components of a system.

• Non-deterministic behavior in information systems means that identical inputs do not guarantee the same outputs every time due to various influencing factors.

Human Element in Information Systems

• The involvement of people in using information systems introduces variability. Different users may interact with the system differently, leading to diverse outcomes even with the same input data.

• For example, an editorial support system allows multiple users to submit book proposals for approval. Variations in analysis by different individuals can lead to differing results for the same proposal over time.

Case Study: Editorial Decision-Making

• In an editorial context, a book proposal might receive approval one day but be rejected another due to changes in market analysis or differing opinions among reviewers.