Many field studies involve more than one technical phase, each involving different personnel and different methodologies, often by different contractors. Concern has been raised over the difficulty for a single individual to physically oversee all phases
No. Each study must have a single study director who represents the single source of study control. This is explicitly stated in the GLPS at 40 CFR 160.33. Single point of control is necessary to the integrity of the study and to avoid the potential for conflicting instructions and confusion in study implementation.
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