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Capabilities
               Copyright Ventana Systems UK Ltd 2008
What we do ?

           System            DynamIcs


              Policy                      System
              Desig...
Who are we ?

• Small independent consultancy, specialising in
  Vensim/System Dynamics modelling

• Our consultant team h...
Some of our clients


                                     Leading Pharmaceutical




                      Copyright Vent...
System Dynamics



     Skip section   Copyright Ventana Systems UK Ltd 2008
System Dynamics


• A modelling methodology for addressing
  complex business environments using a
  holistic systems appr...
System Dynamics

• System dynamics is an approach to
  understanding the behaviour of complex
  systems over time.

• It d...
Stock & Flow Diagrams


                                      Stock/Level

                 Inflow                        ...
Variables Types

• Stocks –                    Accumulation over time
   – Eg Money, information, people, inventory,

• Fl...
System Delays
                              Time Delay

Decision         Implementation            Results         Consequ...
Feedback
                                                            +
                                                   ...
From Simple Models
                                                          fraction facilities ready

                  ...
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
Ventana Systems Uk
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Ventana Systems Uk

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Overview of Ventana Systems UK Capabilities

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Ventana Systems Uk

  1. 1. Capabilities Copyright Ventana Systems UK Ltd 2008
  2. 2. What we do ? System DynamIcs Policy System Design Description Simulation Products Consultancy Training Copyright Ventana Systems UK Ltd 2008
  3. 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. 4. Some of our clients Leading Pharmaceutical Copyright Ventana Systems UK Ltd 2008
  5. 5. System Dynamics Skip section Copyright Ventana Systems UK Ltd 2008
  6. 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. 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. 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. 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. 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. 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. 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

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