UML Sequence Diagrams

1. Introduction

A central distinction between OOA and structured analysis is decomposition by concepts (objects) rather than decomposition by functions. The key point in this decomposition is to find what can behave, and then to decide later on in the design and implementation how they behave to realize the system functionality. Object-oriented requirement analysis is more concerned in identifying concepts related to the requirements and to create a conceptual model of the problem domain or the application area we are working with. This activity is will guide you on how to identifying objects or concepts and make them relate to each other and finally create a conceptual or domain diagram.

Source: Ellen Ambakisye Kalinga, https://oer.avu.org/bitstream/handle/123456789/667/CSI%203104_EN%20Object%20Oriented%20Analysis%20and%20Design1.pdf?sequence=1&isAllowed=y
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