There are eight skills covered by William's taxonomy, four are based on cognitive skills and four on affective skills.

The four cognitive skills relate to the four basic skills of creativity:

Fluency: The generation of many ideas, responses, answers, solutions to a given situation/ problem.
Flexibility: The generation of a range of different alternatives, variations, adaptations, different ideas/ solutions/ options.
Originality: The generation of new, unique and novel responses/ solutions.
Elaboration: The expansion, enlargement, enrichment or embellishment of an idea to make it easier for others to understand or to make it more interesting.

The four affective skills:

Risktaking: Experimenting, trying new challenges.
Complexity: The ability to create structure/ order out of chaos to bring logical order to a given situation and/or see the missing parts.
Curiosity: The ability to wonder, ponder, contemplate or puzzle.
Imagination: The ability to build mental pictures, visualise possibilities and new things or reach beyond practical limits.

The following links provide further information about William's Taxonomy.

http://www.aspa.asn.au/Projects/english/rationl.htm
Follow the thinking skills/creative thinking link to view a description of the aspects of William's Taxononmy ...

http://www.wanpardaeec.qld.edu.au/bla_pac.htm
An example of how William's Taxonomy can be used in conjunction with other thinking skills methods ...