Principle 16: Control Technical Diversity

Classification:  Technology Principle

Statement: Technological diversity is controlled to minimise the non-trivial cost of maintaining expertise in and connectivity between multiple processing environments. We accept that there is never a one size fits all model, but endeavour that technology components are able to work together.  However, detriment to the end users’ experience should be limited.

Rationale: There is a real, non-trivial cost of infrastructure required to support alternative technologies for processing environments. There are further infrastructure costs incurred to keep multiple processor constructs interconnected and maintained.


Limiting the number of supported components will simplify maintainability and reduce costs.

The business advantages of minimum technical diversity include: standard packaging of components; predictable implementation impact; predictable valuations and returns; redefined testing; utility status; and increased flexibility to accommodate technological advancements. Common technology across the enterprise brings the benefits of economies of scale to the enterprise.  Technical administration and support costs are better controlled when limited resources can focus on this shared set of technology.


  • Policies, standards, and procedures that govern acquisition of technology must be tied directly to this principle.
  • Technology choices will be constrained by the choices available within the technology blueprint. Procedures for augmenting the acceptable technology set to meet evolving requirements will have to be developed and put in place.
  • We are not freezing our technology baseline. We welcome technology advances and will change the technology blueprint when compatibility with the current infrastructure, improvement in operational efficiency, or a required capability has been demonstrated.