Models

a software system of any nontrivial size. … as you add features and functionality, … and then there's many other variables and factors … So since we can't fully grasp … and understand software systems, … our interactions with it will be through models. … what we're talking about when we discuss models. … A model is just a simplified representation … of whatever aspect of reality we're looking at. … If we're looking at a software application, … so we will use a model to represent it in our head. … Sometimes these models are explicit. … For example, we might draw a map showing … how the various parts of the application work together. … For example, you might click on a delete button … and then feel surprised when there's no … are you sure you want to delete this request. … that said clicking delete buttons causes … When you were surprised by what the software did, … it revealed to you a place where your model of the program … differed from the reality of what it did. … Sometimes this is because the model that you have is wrong, …