Fairytales are organised using two types of index based upon the Finnish school of thought. The first type of index is called (g)

and shows the influences of cultural factors. A good example would be the Icelandic tale called

which is the Icelandic gerð of

The oldest index of this type (Verzeichnis der Märchentypen) was made in

by Finnish folklorist,

He then revised this and published another gerð index (The Types of Folktale) with

in

The Icelandic folklorist named

made his own gerð index of Icelandic fairytales (Verzeichnis Isländischer Märchenvarianten) which has the index number:

.

The second index is focused upon (m)

and distinguishes certain events or motifs within the stories. These are the

of each tale. The first index of this type was made by

and one of was made for Iceland concerning saga literature in

by

called

.

Vladimir Propp was a Russian

in the early

century and in 1928 published his work called

or, in Icelandic:

.

He based his research upon folklore collected by

and his purpose was trying to find the structural

in fairytales.

He believes that the foundations of a story are

interchangeable

and don't have to contain all of the patterns (frásagnaliðir), apart from

8 and 18

which they must have to be a fairytale.

Danish folklorist Bengt Holbek published his research into the storytellers of Jutland under the title

Interpretation of Fairytales: Danish Folklore in a European Perspective