These potential voters cannot be reached by the pollsters, who survey a random sample based on all residential telephone numbers in a geographic area.
But natural historians, who survey large swathes of diversity in one synoptic glance, and are prepared to make mistakes along the way, are Aristotelian by nature.
Save the Children supports this network of health workers, who survey their environs like hawks, making sure everybody has the contraception they need.
But even those filmmakers who shoot in black-and-white are alive to the vividness of what they see, and even those who survey the grimmest imaginable landscapes insist on the redeeming possibility of beauty.
Inverse surveillance is a branch of sousveillance, the term coined by University of Toronto professor Steve Mann, and it emphasises "watchful vigilance from underneath", by citizens, of those who survey and control them.
For many who survey an African landscape strewn with political wreckage, nowadays merely to raise the subject of European colonialism, which formally ended across most of the continent five decades ago, is to ring alarm bells of excuse making.
WHO survey data released in 2010 revealed that more than half of the people living in countries in the Pacific Islands region were overweight, with some 80 percent of women in American Samoa found to be obese.
Both are journeys of intellectual discovery in which those who survey experience from an initially chosen point of view must be open to correction in the light of further experience.
Sports Interactive, the London-based studio behind the game, employs no fewer than 1,300 researchers around the world, ranging from bloggers who every week watch promising youngsters on the training field up to professional consultants who survey the first teams playing under the Friday night lights.
We contacted interviewees who survey respondents identified as "key contacts" about the SCALE-UP reform effort.
Customers include farmers who seek to improve planting and fertilizing yields and engineers who survey tracts or direct bulldozers for grading.
