What is Intelligent design?
"The theory of intelligent design (ID) holds that certain features of the
universe and of living things are best explained by an intelligent cause rather than an undirected process such as natural selection.
ID is thus a scientific disagreement with the core claim of evolutionary theory that the apparent design of living systems is an illusion
that can be adequately explained by only natural causes.” 
ID should not be confused with biblical
creationism as ID looks for intelligence in nature and biblical creationism starts with the Bible account of creation and interprets
nature from that standpoint. ID does not specify the age of the earth or that the designer is the God of the Bible. 
are the sources of opposition to ID?
There is not just one source of opposition. Atheists strongly
oppose ID because intelligence means there must have been a designer, a concept that they hate because of its implications, and therefore
they prefer to view everything as coming about by materialistic evolution. Some may oppose ID from the mistaken view that
science must involve only naturalistic explanations. Others may resist change from the current evolutionary dogma that they
have been trained to accept. Some may resist because of the negative propaganda against ID or their scientific associates oppose
it. Still others may oppose it for pride, monetary reasons and the fear of being expelled. The concept of a designer is
not out of the realm of science if science is truly the objective search for knowledge whereever that search me lead.
Is ID Science?
ID is science because it is “knowledge about or study of the natural world based on facts
learned through experiments and observation”  and utilizes the scientific method. Actually, there is not just one scientific
method; however, the one commonly used includes a four step process. That process is indicated below as applied to ID:
1. Observation(s) - “Certain features of the universe and living things” have the appearance of being designed
2. Hypothesis - “Certain features of the universe and of living things are best explained by an intelligent cause rather
than an undirected process such as natural selection”
a. Find what are the indicators of design by intelligent agents
(1) Irreducible complexity - “a single system composed of several well-matched interacting
parts that contribute to the basic function, wherein the removal of any one of the parts
causes the system to effectively cease functioning.” 
(2)Specified complexity - meets all of the following requirements:
(a)not due to natural law
(b) highly improbable
(c) conforms to an independently given pattern 
(3) Inference - choose among the alternative competing theories and select the one that
provides the best explanation  
principle - intelligent design indicated by the remarkable fine- tuning of “over
a dozen universal constants (including the strength of gravity, the strength of the
electromagnetic force, and the ratio of the masses of the proton and electron)” for life. “If
any of these constants were even slightly different, the universe would be uninhabitable.”  
(5) Other forms of design detection
b. Compare empirical evidence for selected
features of living things and/or the universe against one or more of
the design indicators in item 3a.
4. Conclusion(s) - state the results and in addition preferably make predictions
that may also be tested.
Some examples of intelligent
design include the bacterial flagellum,  the biochemistry of animal sight,  information in the DNA transcending natural laws,, biological machines in cells,  the extreme improbability of one functional protein being made by chance,  the blood coagulation
cascade,  and the fine-tuning of universal physical constants to support life. [2 ] 
One criticism of ID is that its adherents have not performed any experiments. The scientific method
does not require that scientists perform experiments if the empirical data can be obtained by research of scientific peer reviewed
publications. In recent years, there have been a tremendous increase in the knowledge of biological systems readily available
to ID researchers.
The World Encyclopedia reference below provides a good history and summary of intelligent
design. It includes ideas on intelligent design from some of the leading ID theorists.
Intelligent Design, http://intelligentdesignnetwork.org/
 Intelligent Design, http://www.newworldencyclopedia.org/entry/Intelligent_design
Science definition, Merriam-Webster Online, August 20, 2014, http://www.merriam-webster.com/true-or-false/index.htm
 Meyer, Steven,Signature in the Cell: DNA and the Evidence for Intelligent Design, (New York: HarperCollins Publishers, 2009), 154-159
 The Privileged
Planet, DVD, (Illustra Media, 2004), http://www.Illustramedia.com
 Behe, Michael, Darwin’s Black Box, (New
York: The Free Press, 1996), 69-73
 ibid., 18-22
 Meyer, 341
 Unlocking the Mystery of Life, DVD, (Illustra
Media, 2002), Chapter 10, http://www.Illustramedia.com  Meyer, 212
 Behe, Chapter 4