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# Author Archives: modelpractice

## What kind of Computer Science matters?

Just came across Why Computer Science Matters? by Vugranam Sreedhar. He observes a decline in real computer scientists in favour of ‘commodity programmers’. Basically, I have to (sad but true) agree here, and would like to take a closer look … Continue reading

## Modeling & Abstraction at the very heart of Business Requirements Analysis

From industrial practice we know a BA definitely adds a lot of value to an IT project. So, now we try to conceptualise this in contrast to the Biz Engineer’s and IT Architect’s role. As we’ll see, a BA’s special benefit is mainly based on abstraction (and thus modeling). Continue reading

## Modelling with Classes: Square and Rectangle revisited

Classic problem in class-modelling: how to express that a square is a special kind of rectangle? In order to deepen understanding, let us scrutinize the situation a bit closer here, using logical/ structural foundations of modelling: Continue reading

## Craftsman or Engineer?

A lot has been written on the differences between Craftsman and Engineer. Recently I came across a simple example by Hofstadter & Sander, that nicely shows the basic difference in thinking: Continue reading

Posted in Abstract Thinking, Software_Engineering
Tagged abstraction, analogy, craft, craftsman, craftsmanship, Douglas Hofstadter, Emmanuel Sander, engineer, engineering, Hofstadter, marking, model, Modelling, parallelogram, rectangle, rhombus, software engineering, square, surfaces and essences
4 Comments

## Reflections on Abstractions: Subsumption I

We’re going to look at a subsumptional mapping from lhs original to rhs model. We will get four cases of subsumption as in figure (strictest cases), which now can be developed into a continuum with the four cases as corner points. Continue reading

## Reflections on Abstractions: From ‘Siamese’ Graphs to Concept Lattices

There is an elegant construct of dealing with ‘Siamese’ abstractions for object-attribute situations, from formal concept analysis. Where ‘Siamese’ means not-rhs-unique mapping of complete subgraphs. Continue reading

## Reflections on Abstractions: Subsumptions and Omissions

In addition to the recent posting ‘Abstractive and Functional Mappings’ we provide a simple visualisation of subsuming and omitting abstractions. Continue reading

Posted in Mathematics, Reflections on Abstractions
Tagged abstraction, Graph, left-total, left-unique, lhs, Mapping, model, modeling, omission, reflections on abstractions, Relation, rhs, ROA, subsumption
1 Comment

## Reflections on Abstractions: Abstractive vs Functional Mappings

We introduce the concepts of subsuming and omitting mappings, and see how they are better suited for abstraction and modelling than the classical mathematical concept of functions. Continue reading

Posted in Mathematics, Reflections on Abstractions
Tagged abstraction, bijection, function, Graph, left-total, left-unique, lhs, Mapping, model, modeling, reflections on abstractions, Relation, rhs, ROA, total, unique
3 Comments