The book is well researched. (=the writer has studied this subject very carefully and thoroughly)
STUDY NOTE: Grammar
Do/carry out/conduct research (into) is more common than research (verb).
investigate verb [intransitive and transitive] to try to find out all the facts about something in order to find out the truth about it. Investigate is often used about accidents and crimes. It is also used about scientific studies into a specialized subject:
The authorities in California are still investigating what caused the crash.
Psychiatrists first began to investigate the effects of the drug in the late 1960s.
Greenpeace has been investigating the environmental impact of dumping nuclear waste in the ocean.
examine verb [transitive] to consider or look at something carefully in order to find out more about it:
The professor and his team have been examining different methods of predicting earthquakes.
The aim of the research is to examine how people's experiences in the classroom affect their choice of career in later life.
evaluate verb [transitive] to examine something in order to decide how good, useful, important etc it is:
The best way to evaluate any treatment is to carry out trials on large groups of patients.
The Commission will evaluate the relative costs and benefits of the three possible airport sites.
analyse verb [transitive] British English, analyze American English to study something in detail, especially figures and results from research:
US scientists have been analyzing the latest data (information obtained from research) about global warming.
In a recent study, researchers analysed the results of seven criminal trials. 2. The work of studying something
study noun [countable] a piece of work in which someone examines a particular subject in order to find out more about it, and writes about what they have found:
The study showed that 25 percent of adults do not eat breakfast at all, compared with 14 percent in 1961.
Recent studies suggest that our sense of smell is closely linked with the part of the brain that deals with memory.
Of the 176 patients who took part in the study, 97 said they noticed a significant improvement in their condition.
In one study of almost 80,000 women, researchers found that those who used artificial sweeteners gained more weight over a year than those who ate sugar.
research noun [uncountable] careful detailed work that is done in order to find out more about a subject, especially as a part of a scientific or academic project:
Billions of dollars have been spent on research into the causes and treatment of cancer.
The University has for a long time been a leading centre for research in this field.
Some people think that cigar smoking is safer than cigarette smoking. Recent research suggests that this is untrue.
In his research, he showed that the islanders once had a highly developed culture. STUDY NOTE: Grammar
Study is a countable noun, and can be used in the plural, for example: There have been many studies on this subject. Research is only used as an uncountable noun, for example: A lot of research has been done on this subject.
work noun [uncountable] the studies that have been done on a particular subject:
Faraday is famous for his work on electricity.
A lot of work has been done on hydrogen-powered cars.
Their work had an enormous influence on the study of genetics.
experiment noun [countable] a scientific test in order to find out what happens when you do something:
They carried out a series of experiments (=they did a series of experiments) in order to try to prove their theory.
Experiments have shown that there is an increased risk of some forms of cancer.
In his experiment, Pavlov only fed the dogs while ringing a bell.
Many people think that there should be a ban on experiments on live animals.
STUDY NOTE: Grammar
Conduct an experiment is more formal than do an experiment or carry out an experiment.
test noun [countable] a process that is intended to find out something, for example how good or safe something is, or whether someone has an illness:
A simple blood test will show whether you have the virus or not.
The doctors did some tests to find out if the couple were able to have children.
All new furniture must undergo tests (=have tests) to make sure that it does not catch fire easily.
Tests have shown that pigs and sheep are actually highly intelligent animals. STUDY NOTE: Grammar
Conduct a test is more formal than do a test or carry out a test.
trial noun [countable] a test to find out whether a new drug, product, system etc is safe, effective etc:
The drug is currently undergoing clinical trials in the US. (=it is being tested by medical researchers there)
Farmers were asked to carry out trials (=do trials) of genetically modified crops.
3. A piece of writing by someone who is studying a subject
essay noun [countable] a piece of writing about a subject. Essay is usually used about a piece of writing by a student at school or university. It is also used about a short piece of writing about a subject by a writer, especially one who is well-known:
Every student on this course will have to write at least one essay on Shakespeare.
In this essay, I will attempt to explain some of the reasons why young men become involved in violent crime.
As was mentioned earlier in this essay, much work still remains to be done on this subject.
In his essay, he compares the theories of several well-known Greek philosophers.
The American writer, Susan Sontag, published a famous collection of essays on photography.
paper noun [countable] a piece of writing about a subject, written by a student as part of their studies, or by someone who has studied a subject as part of their research. Sometimes papers are given as talks at large academic meetings, or published in collections of academic writing about a subject:
Paul has to write a paper on American fiction from 1900 to 1930 for a seminar next week.
The professor has published over forty scientific papers on diseases of tropical crops
She gave a paper on (=gave a talk on) "Women and Science" at a conference in Minneapolis.
dissertation noun [countable] a piece of writing about a subject, which is written as part of a university degree:
In the third year of their course, students have to write a 10,000 word dissertation on a topic that has been approved by their tutor.