According to J.P. Guilford, the proponent of the Structure of Intellect Model, mental abilities or intellectual capacities are classified under how many dimensions, and what was the total number of factors initially proposed by him?

The Structure of Intellect Model proposed by J.P. Guilford posits that human intelligence is the result of the interaction of three independent dimensions: Operations, Contents, and Products. In the initial model, he divided these into 5, 4, and 6 categories respectively, resulting in a total of 120 independent intellectual factors ($5 \times 4 \times 6$). Through later revisions, this number increased to 150 and then to 180. This model is regarded as one of the most comprehensive and multidimensional structural models of intelligence.