A Growth and Underinvestment with a Drifting Standard structure is simply an elaborated Growth and Underinvestment structure where the growth inhibitor induces a decline of the standard over time. The real nasty thing about this structure is that the growth inhibitor influence sets up a Reinforcing Loop which even further promotes a drifting of the standard over time. There is a also a video for this insight which is a component of the Systems Thinking World Kumu e-Learning Environment.
This structure is just the Growth and Underinvestment structure with an annoying Drifting Goals components grafted onto it. Because of the delay in developing [inhibitor avoidance] the [growth inhibitor] provides a pressure to lower the [standard]. This then decreases the [perceived need] and we have a vicious Reinforcing Loop R4 where the more we lower the [standard] the more we need to lower the [standard].
The Simulation model should be a rather straight forward mapping of the Causal Loop structure. [action factor], [inhibitor factor] and [need factor] have been added to make it easy to adjust the interaction rates.
With an [inhibitor factor] = 0 this structure is a simply reinforcing loop.
With a [need factor] = 0 there is no [Inhibitor Avoidance] and the standard begins to erode immediately.
With an initial [Inhibitor Avoidance] and [need factor] the [standard] is maintained for some time. As the [standard] begins to erode [Inhibitor Avoidance] stops growing enabling the [growth inhibitor] to have an increasing impact.
Strategy: As with the Growth and Underinvestment structure knowing ahead of time is the best option. In this instance it is critical that you realize that if you allow the [standard] to slip you'll have to allow it to slip even further. Nail it down and work on capacity development post haste.
Please interact with this structure by altering the parameters in the Parameters Panel on the right and run Simulations until you feel you have a comfortable understanding of behavior of this structure.