Site News

DATE	NEWS
2025-04-10	We have of necessity had to pause development of this site for one year while we dealt with other issues. We have redesigned the methodology we originally proposed in order to include both logical and transactional activities in a single model. In addition we will be changing the nature of the graphical representation of a model to directed graphs. The vertices of these graphs will represent instances of objects that represent the state of the system at any point in time. Links in the directed graph will be objects that determine the nature of the connectivity between the vertices. We will continue calling our methodology eXtended System Dynamics (XSD) but the methodology itself will bear little resemblance to the System Dynamics methodology of the past. That methodology has proven far too restrictive for general purpose modeling of both discrete and continuous variables, and events of a similar nature. Essentially the Methodology section of the Model Construction collection will be rewritten. In addition we will be writing our models wholly in Python. Python and its libraries have matured to the point where they far exceed the capabilities of a Java based Application Programming Interface (API) for scientific work. Links to the most recent additions to this site are located in the Resources section of the navigation pane found on the Site Map page. There is a newly formulated Resource Datatbase and a new Level 1 Study Plan. These are constructed as collections rather than as hierarchies that were based on predetermined keywords. This formulation of the Resource Database provides a great deal of flexibilty in terms of organization and presentation. At this point we recommend opening the Resource Database and separating it from this window by dragging its tab outside this window. Let's also define what we mean by a collection. A collection is simply a set of objects. In our case the objects (actually references to objects) are resources of various types or other collections. If a resource is a printed book either hardbound or paperback, then we do not explicitly state its type; most of the resources in this database are printed books. More formally a collection is defined by the statement collection = { resource(s), collection(s) } The Resource Database itself is a collection of only collections. Resource Database = {systems science, mathematics, computer science, information science, natural sciences, engineering, biosystems, human biosystem, social sciences}. You can confirm this by scrolling down the Resource Database page. The collection systems science is also a set of collections: { systems thinking, system dynamics, networks, complexity, spontaneous order } The collection systems thinking consists of a primary and secondary (supporting) resource. {Sanjoy Mahajan, The Art of Science; Sanjoy Mahajan, Street Fighting Mathematics}. If the primary resource is followed by a resource in the next column as shown here, then that resource is implicitly defined as a secondary or supporting resource. More than one resource of either type is entered in the cell directly below the first. If there is more than one supporting resource, then the preceding cell is left blank until we reach the next primary resource For the purpose of understanding the location of entries in this table, the description above provides a necessary and sufficient description of the relationships among the entries. The study plan we propose for mastering the skills related to modeling complex systems can be accessed using the link below the Resource Database link in the navigation pane. This link is labeled Level 1 and reveals a selected subset of the Resource Database. Only level 1 in the studies sequence is provided at this time. It is estimated that the studies for this level can be completed in about a year of full time study. Much less time will be required if you have completed a scientific curriculum at the college level. Included in these studies are references for building a personal website, which may prove helpful in communicating your ongoing work to interested parties.
2025-04-09	NOTE This site makes significant use of pdf documents. When generated they obscure the original page being read. Pull the pdf document off the original by using the new document's tab. You will often find new text on the original page explaining the nature of this new document. In addition you may simply want to view the contents of this new document while working on other pages. Otherwise you can leave it conected to the window and move back to the original page by clicking on the tab associated with the original page.

DATE

NEWS

2025-04-10

We have of necessity had to pause development of this site for one year while we dealt with other issues. We have redesigned the methodology we originally proposed in order to include both logical and transactional activities in a single model. In addition we will be changing the nature of the graphical representation of a model to directed graphs. The vertices of these graphs will represent instances of objects that represent the state of the system at any point in time. Links in the directed graph will be objects that determine the nature of the connectivity between the vertices. We will continue calling our methodology eXtended System Dynamics (XSD) but the methodology itself will bear little resemblance to the System Dynamics methodology of the past. That methodology has proven far too restrictive for general purpose modeling of both discrete and continuous variables, and events of a similar nature.

Essentially the Methodology section of the Model Construction collection will be rewritten. In addition we will be writing our models wholly in Python. Python and its libraries have matured to the point where they far exceed the capabilities of a Java based Application Programming Interface (API) for scientific work.

Links to the most recent additions to this site are located in the Resources section of the navigation pane found on the Site Map page. There is a newly formulated Resource Datatbase and a new Level 1 Study Plan. These are constructed as collections rather than as hierarchies that were based on predetermined keywords. This formulation of the Resource Database provides a great deal of flexibilty in terms of organization and presentation.

At this point we recommend opening the Resource Database and separating it from this window by dragging its tab outside this window.

Let's also define what we mean by a collection. A collection is simply a set of objects. In our case the objects (actually references to objects) are resources of various types or other collections. If a resource is a printed book either hardbound or paperback, then we do not explicitly state its type; most of the resources in this database are printed books.

More formally a collection is defined by the statement collection = { resource(s), collection(s) }

The Resource Database itself is a collection of only collections. Resource Database = {systems science, mathematics, computer science, information science, natural sciences, engineering, biosystems, human biosystem, social sciences}. You can confirm this by scrolling down the Resource Database page.

The collection systems science is also a set of collections: { systems thinking, system dynamics, networks, complexity, spontaneous order }

The collection systems thinking consists of a primary and secondary (supporting) resource. {Sanjoy Mahajan, The Art of Science; Sanjoy Mahajan, Street Fighting Mathematics}. If the primary resource is followed by a resource in the next column as shown here, then that resource is implicitly defined as a secondary or supporting resource. More than one resource of either type is entered in the cell directly below the first. If there is more than one supporting resource, then the preceding cell is left blank until we reach the next primary resource

For the purpose of understanding the location of entries in this table, the description above provides a necessary and sufficient description of the relationships among the entries.

The study plan we propose for mastering the skills related to modeling complex systems can be accessed using the link below the Resource Database link in the navigation pane. This link is labeled Level 1 and reveals a selected subset of the Resource Database. Only level 1 in the studies sequence is provided at this time. It is estimated that the studies for this level can be completed in about a year of full time study. Much less time will be required if you have completed a scientific curriculum at the college level. Included in these studies are references for building a personal website, which may prove helpful in communicating your ongoing work to interested parties.

2025-04-09

NOTE
This site makes significant use of pdf documents. When generated they obscure the original page being read. Pull the pdf document off the original by using the new document's tab. You will often find new text on the original page explaining the nature of this new document. In addition you may simply want to view the contents of this new document while working on other pages. Otherwise you can leave it conected to the window and move back to the original page by clicking on the tab associated with the original page.