Lecture 7 - domain modelling prt 2

Question 1

how do we validate?

Answer 1

• evaluate if model copes with real world situation

1. make up a situation, 2. draw object diagram to represent situation, 3. evaluate how model copes with situation

Question 2

what does a fact based approach involve?

Answer 2

-express the info structure for a domain in terms of elementary fact types (student 123 is jake carra) and constraints on fact types

Question 3

what are the steps to fact based approach?

Answer 3

-identify elementary fact types, -draw fact types, -add uniqueness constraint

Question 4

how do we identify elementary fact types?

Answer 4

express as sentences (student 123 is jake carra), then add lexical associations between non-lexical entities (student(ID))

Question 5

difference between lexical and non-lexical?

Answer 5

lexical - contains all info

non-lexical - cannot be described in 1 sentence (eg student needs to be associated with id, student(id))