Gagne in his book "The conditions of learning" has described how

SOLUTION

Robert Mills Gagne, an American educational psychologist. He had written a book named 'The Conditions of Learning'. 

In this book, he has proposed a hierarchy of learning in which learning tasks are organized in a hierarchy based on their complexity level.

This learning hierarchy is divided into eight intellectual levels or in eight types of learning which implies the idea that:​

• there are different kinds of levels of learning which require different kinds of instruction.
• an individual has to first master a lower intellectual level in order to acquire higher intellectual level skills.

Gagne's Eight Intellectual Levels or Eight Types of Learning: 

• Signal learning: The learner makes a general response to a signal.
• Stimulus-response learning: The learner makes a precise response to a signal.
• Chaining: The connection of a set of individual stimulus and responses in a sequence.
• Verbal association: The learner makes associations using verbal connections.
• Discrimination Learning: The learner makes different responses to different stimuli that are somewhat alike.
• Concept learning: The learner develops the ability to make a generalized response based on a class of stimuli.
• Rule learning: A rule is a chain of concepts linked to demonstrated behavior.
• Problem-solving: The learner discovers a combination of previously learned rules and applies them to solve a novel situation.

Hence, it could be concluded that Gagne has proposed 'Eight Types of Learning' in his book "The conditions of learning".