"when changes occur" is a correct and usable phrase in written English.
You can use it when you want to refer to a situation in which something has changed or is changing. For example: "When changes occur in the economy, people can struggle to make ends meet."
No matter how onerous it feels, update your records as and when changes occur.
Cogenerations systems are energy efficient but when changes occur to the original design they can seem financially risky.
The Enchantment Whiteboard goes beyond the web server analogy by allowing clients to subscribe to portions of the whiteboard, automatically receiving updates when changes occur.
The previous controllers are robust in the sense of being insensitive to spillover and maintaining the closed-loop stability when changes occur in the plant parameters.
In Rio de Janeiro, IBM has worked with local authorities to create a new automated alert system that will notify city officials and emergency personnel when changes occur in the flood and landslide forecast for the city.
The CM function must ensure that what crosses the bridge is properly documented, minimally controlled, available as and when needed, and that feedback is obtained as to when changes occur in the product.
'Improvement' was concluded when changes occurred in the direction of improvement.
You can find in those same companies a drop in performance as the very culture that made the company successful became a liability when changes occurred in technology and in the market.
This can be realized when changes occurred mainly within modules.
Joinpoint validated these findings and identified the specific points when changes occurred.
Joinpoint analysis enabled identification of specific points in time when changes occurred, and provided estimates of the actual intercept and slope for each segment.
