I'm a psychologist, so you won't be surprised that my choice of classic studies concern the mental processes rather than the social processes involved in learning.
But most observational studies concern not remedies for present ills but protection against future ones, and for these cases it is hard to tell if even relatively small costs or risks of harm outweigh the probability of partial protection.
Especially significant studies concern the Mother Lode system, Jurassic stratigraphy and its relation to intrusive granites, glacial erosion, placer gold, multiple intrusions, isotope ages, and chronology and nature of emplacement.
If research was limited to those kinds of studies, concern might be premature.
A few studies concern equipment design, working environments and factors affecting individual workers.
The majority of studies concern changing pseudonyms to prevent linking messages of the same pseudonym.
Numerous empirical studies concern the identification of usability problems on the basis of observable user behaviour [5].
Some studies concern not the general population but, instead, particular subgroups of it (eg, children and/or adolescents, the elderly).
The cited studies concern the fields of rhinology, audiology, phoniatrics, vestibulology, oncology, sleep apnea and salivary gland diseases.
The previous experimental and theoretical studies concern mostly with dynamic properties, vibration isolation schemes and vibration-reduction effectiveness analysis.
The studies concern a turbulent propane air (C3H8 O2/N2) diffusion flame under ambient conditions at a Reynolds number of Re= 104.
