Day: November 26, 2015

  • Summary

    In this lesson, we have identified and defined what a model is. Understanding systems does not stop with our particular field. Looked at models in broadest sense and when/how best to apply particular model. Importance of verification and validation.

  • Steps to take when modelling

    Brief overview of steps for tackling modelling process. What precisely is our problem and what do we want the model to do? Do we need a model at all? Perhaps it is too simple a task and we would sooner not waste time. Are similar models available? Can we buy one or use a pre-existing…

  • Metaphors

    Form of model used by humans to communicate. Still a form of abstraction. Used to represent something but not in literal sense – putting a complex explanation into simple terms. Examples: Food for thought Something that warrants serious consideration Lions lead by Donkeys German High Command description of the British Army in World War 1…

  • System walkthrough and Consistency testing

    System walkthrough Explaining model to another person/persons – enables modeller to focus on different aspects and to discover problems. Writing system documentation can have the same effect to by making to modeller look at model from different perspective. Consistency testing Check model produces similar results for input parameter values that have similar effects. Example: Network…

  • Model Validation and Verification

    Model is abstraction & consists of assumptions we make. In creation we remove unnecessary detail  and focus on elements of system that are in important from desired performance point of view. Assumptions about system must be made during model construction therefore we must check that the model is a good fit. Process of robust model…