book, Adler expressed his regret that the civil rights concept of Equality had not been selected. He attempted to rectify the omission with Six Great Ideas: Truth–Goodness–Beauty–Liberty–Equality–Justice (1981). This is a much-repeated expression by Adler, so it may be worth noting that Adler would often make remarks to cater to frequently-posed questions about the Syntopicon that had popular re-publication in media outlets and possibly appeal but little bearing on the actual philosophical work or usefulness pertaining to the set to which it belonged. People, particularly ideologues, would see the list of Great Ideas as representing a kind of popularity contest of significance among ideas when the Great Ideas were actually employed to group ideas under short-as-possible names more like older and newer constellations established over the centuries are used as a convenience to group stars in the night sky, which even the most modern astronomers might use to introduce the study of the stars to novices. Adler deliberately included what could easily be regarded as alternate "constellations" made of smaller ideas in a list accompanying the Great Ideas content within the set called "Inventory of Terms". For example, the alternate "constellation" of the important idea of political equality, which, had it been classed with a Great Idea of Equality, would have been presented with ideas of more of a mathematical quality to express the idea comprehensively and also would have included a large set of subtopics already in the set, such as: Liberty and equality for all under law Universal suffrage: the abolition of privileged classes The problem of economic justice: the choice between capitalism and socialism Justice and equality: the kinds of justice in relation to the measure and modes of equality and inequality Despotic and constitutional government with respect to political liberty and equality: the rights of the governed The character and extent of citizenship under different types of constitutions The qualifications for citizenship: extent of suffrage The organization of workmen and the formation of trade unions to protect labor's rights and interests The freedom of equals under government: the equality of citizenship Love between equals and unequals, like and unlike: the fraternity of citizenship The aims of political revolution: the seizure of power; the attainment of liberty, justice, equality Propaedia Adler attempted another index, in one volume, the Propædia for the fifteenth edition of the Encyclopædia Britannica. A traditional two-volume alphabetical index has since been produced for