Mining over the next 20 years consisted of sinking the Main Shaft and development of a small open cut. Additional shafts were excavated between and and then again between and by various parties. Sincein excess of holes have been drilled at Dargues Reef.
Description[ edit ] The REA model gets rid of many accounting objects that are not necessary in the computer age. Most visible of these are debits and credits— double-entry bookkeeping disappears in an REA system. Many general ledger accounts also disappear, at least as persistent objects; e.
The computer can generate these accounts in real time using source document records. REA treats the accounting system as a virtual representation of the actual business. In other words, it creates computer objects that directly represent real-world-business objects.
In computer science terms, REA is an ontology. The real objects included in the REA model are: For example, a conventional accounting asset such as goodwill is not an REA resource. There is a separate REA model for each business process in the company.
A business process roughly corresponds to a functional department, or a function in Michael Porter 's value chain. Examples of business processes would be sales, purchases, conversion or manufacturing, human resources, and financing. At the heart of each REA model there is usually a pair of events, linked by an exchange relationship, typically referred to as the "duality" relation.
One of these events usually represents a resource being given away or lost, while the other represents a resource being received or gained.
For example, in the sales process, one event would be "sales"—where goods are given up—and the other would be "cash receipt", where cash is received. These two events are linked; a cash receipt occurs in exchange for a sale, and vice versa.
The duality relationship can be more complex, e. REA systems have usually been modeled as relational databases with entity-relationship diagramsthough this is not compulsory.
The philosophy of REA draws on the idea of reusable Design Patternsthough REA patterns are used to describe databases rather than object oriented programs, and are quite different from the 23 canonical patterns in the original designs pattern book by Gamma et al.
Research in REA emphasizes patterns e. The pattern is extended to encompass commitments promises to engage in transactions, e.
Here is a diagram of an extended REA pattern from Hruby et al. McCarthy actively involved in the standards committee. Further reading[ edit ] Hruby, P.Research dealing with various aspects of the theory of planned behavior (Ajzen, , Ajzen, ) is reviewed, and some unresolved issues are timberdesignmag.com broad terms, the theory is found to be well supported by empirical evidence.
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