Maintain quality assurance throughout the survey. There is no point doing the perfect design if you don't know how well it is implemented and how well your methods reflect the broader environmental characteristics.
Hurlbert (1984) states that "... it is clear that experimental design and experimental execution bear equal responsibility for the validity and sensitivity of an experiment. Yet in a practical sense, execution is a more critical aspect of experimentation than is design. Errors in experimental execution can and usually do intrude at more points in an experiment, come in a greater number of forms, and are often subtler than design errors. Consequently, execution errors generally are more difficult to detect than design errors both for the experimenter himself and for readers of his reports. It is the insidious effects of such undetected or undetectable errors that make experimental execution so critical." Quality assurance
is the only way to guard against these errors and a quality assurance plan should be considered, if only to think through the sources and kinds of errors and the consequences for interpretation.