Ventana Systems Uk
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This document provides an overview of Ventana Systems UK Ltd, a small consultancy specializing in system dynamics modeling. It describes their services such as policy design, simulation, and training. It also discusses key concepts in system dynamics modeling like feedback loops, stocks and flows, variables, delays, and how simple models can evolve into more complex models.
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Ventana Systems Uk
- 1. Capabilities Copyright Ventana Systems UK Ltd 2008
- 2. What we do ? System DynamIcs Policy System Design Description Simulation Products Consultancy Training Copyright Ventana Systems UK Ltd 2008
- 3. Who are we ? • Small independent consultancy, specialising in Vensim/System Dynamics modelling • Our consultant team have worked together for 15 years • Bases in – Liverpool – Southampton – Salisbury Copyright Ventana Systems UK Ltd 2008
- 4. Some of our clients Leading Pharmaceutical Copyright Ventana Systems UK Ltd 2008
- 5. System Dynamics Skip section Copyright Ventana Systems UK Ltd 2008
- 6. System Dynamics • A modelling methodology for addressing complex business environments using a holistic systems approach. • The core of System Dynamics is the understanding of the cause and effect relationships within the system and to assess the impact of change. Copyright Ventana Systems UK Ltd 2008
- 7. System Dynamics • System dynamics is an approach to understanding the behaviour of complex systems over time. • It deals with internal feedback loops and time delays that affect the behaviour of the entire system. • What makes using system dynamics different from other approaches to studying complex systems is the use of feedback loops and stocks and flows. Copyright Ventana Systems UK Ltd 2008
- 8. Stock & Flow Diagrams Stock/Level Inflow Outflow External Data Auxiliary Table Constant • Stock and flow diagrams are the most common first step in building a simulation model because they help define types of variables that are important in causing behaviour. Copyright Ventana Systems UK Ltd 2008
- 9. Variables Types • Stocks – Accumulation over time – Eg Money, information, people, inventory, • Flows – Rate stocks change over time – Eg Earnings, Hiring, production rate, • Auxiliary – Formulate complex rate eqns – Eg Desired production, Target workforce, • Constants – Static inputs – Eg Initial stock value, Item price, delay times • Tables – Nonlinear relationships – Eg Demand curves, pre defined dependent variable relationships • External Data – Real world time series – Eg Sales data, census data, interest rates Copyright Ventana Systems UK Ltd 2008
- 10. System Delays Time Delay Decision Implementation Results Consequence • Vacancy to Recruitment – Advertise – Shortlist – Interview – Selection – Notice Period Copyright Ventana Systems UK Ltd 2008
- 11. Feedback + Revenue • Increased Demand Profit + + Higher Price Supply + - • Higher Price + Price Greater Supply Marketing - + Demand • Abundant Supply + Lower Price • Lower Price Greater Demand Action Consequence Copyright Ventana Systems UK Ltd 2008
- 12. From Simple Models fraction facilities ready Orders in Orders Requiring Process Testing orders processing testing target test delay target process delay start orders Testing Capacity test adj time Processing Capacity fraction facilities good Orders proc adj time Requiring Awaiting Service dispatching Activation target service delay target activation activating delay Dispatching Capacity Activating New Capacity Customers dispatch adj time activation adj time Copyright Ventana Systems UK Ltd 2008