For example: established telecommunication companies, "telcos-, continue to use large complex legacy systems for customer support and for their support of their original network capability. Such legacy systems continually undergo development to allow for the use of new technology in the networks they support. The size and complexity of these systems means low priority requests for changes to or extracts from them can take years to fulfil, should they be included as part of a project on the legacy system program. .
In such cases as the above, development teams external to the legacy system program, would use a RAD approach to quickly deliver these applications, e.g. the Dynamic System Development Method (DSDM) (DSDM Consortium, 2002). These development teams often "screen scrape- data from the legacy systems. Screen scraping means using a terminal emulation package that provides an API for pulling information (screen scraping) from the screen and pushing data/keystrokes to the screen of the legacy system. The "wrapped- legacy system acts as a server providing data to the application under development (Sneed, 1996).
Systems development in the type of environment outlined above can cause dynamic inconsistencies. Dynamic inconsistencies refer to differences between requirement specifications and the actual runtime behaviour of the system implementing those requirements (Lamsweerde, Letier and Ponsard, 1997). Such dynamics inconsistencies can arise from changes to assumptions about the environment (Feather and Fickas, 1995) and can be tackled using obstacle analysis (Anton, 1997), (Laamsweerde and Letier, 1998) and requirements monitoring (Feather and Fickas, 1995). With enmeshed systems changes to assumptions about the environment would occur because the application development team is unlikely to know all the relevant details of changes to be implemented in the enmeshed systems due to maintenance.
For its pricing strategies, Carrick primary concerns should be to avoid the evolution of grey markets and as such, this report recommends a skimming strategy that is based on the top end market prices. ...