Final answer:
Deviations from drawings and specifications should be formally documented and approved through a change management process to maintain project integrity.
Step-by-step explanation:
When deviations from drawings and specifications are warranted, these deviations should be formally documented and approved through a change management process. This is critical to ensure that all stakeholders are aware of the changes and that the end product meets the required standards and functionality. Deviations could be necessary due to material unavailability, design errors, or unfeasibility in the field. Regardless of the reason, the process typically involves the proposal of changes, review by relevant authorities or stakeholders, impact assessment, formal approval, and updating of documentation to reflect the changes.