• Is that person impartial? Could they have a reason to lie or misrepresent information?
• How reliable is that person?
Is the claim something that could count as knowledge, or is it merely someone's personal opinion?
By Definition
• Is the definition clear?
• Does everyone agree with this definition?
• Could two people mean something different by these expressions?
Case Study
• Is the case study relevant?
• Does the case study provide a good basis or analogy for the claim?
• Do the results of the case study concur with the claim being made?
Common Belief
• Is this belief true or is it just a popular opinion, common misunderstanding or stereotype?
• Is this belief really held widely across the whole population?
• Is this belief well founded?
• Is this belief free of serious dispute?
• If the claim is a common generalization, is it true or acceptable in this instance?
Data
• How reliable are the data?
• How likely is it that the data could contain errors?
• Could the data have been tampered with?
• Were the data collected using a reliable and appropriate research method?
• Are the data relevant, and do they really support the claim?
Event
• Is the event relevant?
• Who reported the event and are they reliable?
• Does the event support the claim or provide an appropriate analogy?
Example
• How relevant is the example?
• Is one example sufficient to establish the claim? (Sometimes a single example is enough to establish a claim; at other times it isn't.)
Expert Opinion
• Is the expert
o a genuine expert in an area relevant to the claim (i.e. do other experts recognize his or her expertise)?
o sincere?
o trustworthy and disinterested (i.e. free of conflicts of interest)?
o in a reasonable position to make this claim (e.g. if the claim is a prediction or hypothesis)?
o justifiably confident of the truth of this claim?
• Is the claim seriously disputed by other experts in the field?
Law
• Is this Act or precedent relevant to the claim?
• Has the law been superseded?
• Do the details of the claim in question match the requirements of the law?
Media
• Is this media report reliable?
• Has the media report been manipulated in some way, for example, propaganda or commercial interest?
• Is the media form a genuine information source or does it provide mere gossip and innuendo?
• Does the media information provide a balanced view?
Publication
How reliable is this publication?
• How respected or respectable is the author in the relevant field?
• How respected or respectable is the publisher? "t
• If the publication is on the internet, is it made available on a reliable institution's website?
• If the publication is a journal, is it refereed or is everyone accepted for publication?
• How recent is the publication? Could the information be out of date?
Quote
• Is this quote genuine, or is the person being misquoted or quoted out of context?
• Is the quote relevant to the claim above it?
• Does the quote really support (e.g. substantiate or illustrate) the claim?
Remember that when you are evaluating a quote as a basis for a claim, you are not just saying, for example, "It's true that this quote was made by Shakespeare in Macbeth"; rather you are saying, "This quote provides solid/shaky/nil support for the claim above".
Statistic
How reliable is the statistical evidence?
• Are the statistics based on reliable data?
• Was the sample used for the statistics sufficiently large and representative of the population about which it generalizes?
• Are the statistics recent?
• Are there other statistics in this area that show very different results?
• Does the statistic come from a trustworthy, objective, unbiased and disinterested source (i.e. where there is no conflict of interests)? (E.g. who financed the study and why?)
• How big is the leap from the analysis of the data to the conclusion or findings?
o Does the interpretation of the data rely on questionable assumptions?
o If the claim is about a causal link, is there evidence of causation or merely correlation?
Web Resource
• Does the website provide reliable information for the claim being made? (Think about whether it is a .com, .edu or .org address).
• Who operates this website? Are they a credible source?
• Does this website provide balanced views or only one view?