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You can study any number of organisational theories. Most drives for change assume that changes in attitudes lead to changes in behaviour. According to this model, change is like a religious "seeing of the light" experience. Once people "get the vision", changes in their behaviour just happens. I would suggest this approach puts the cart firmly before the horse.
The most effective way to change working practices and, more importantly their perception of their role, therefore, is to put people into a new organisational context, which imposes new roles, responsibilities and relationships on them. This creates a situation that in a sense "forces" new attitudes and behaviour on people. In fact, how an individual behaves is powerfully shaped by the organisational roles people perform.
I personally believe that using one project management methodology such as Prince 2 or Agile does not work well for all projects. After assessing the client's requirements, infrastructure and deadlines I create bespoke solutions which may use elements of Prince 2 and Agile to define the project processes. Learning from the successes and failures of projects is critical when aiming to successfully complete projects. This is borne out in recommendations and references I have received.