The categories resemble those of the 1994 IUCN Red List Categories & Criteria (version 2.3). They can be thought of as morphisms in the category of all (small) categories. Creators categorize their projects into one of 13 categories and 36 subcategories. There are many specializations within these broad categories. Folklorists divide customs into several different categories. There are a variety of technologies that fall under each of these categories. Indicators only apply for characters portrayed within multiple categories. The DSM has attracted praise for standardizing psychiatric diagnostic categories and criteria. There are twelve aspects divided into four categories. They are divided into three main functional categories. These substrates fall into several distinct categories. There is substantial variation in the success rate of projects falling under different categories. These are only for nominations in the Scoring categories. Grouping consists of sorting and possibly ranking the impact categories. All members can however vote for nominations in the best program categories.