Who said "The assignment method is an important step in teaching and learning…

Concept: The Assignment Method is a teaching strategy in which the teacher sets a specific task -- study, research, written work, or problem-solving -- for students to complete largely on their own, so the learners actively apply and consolidate what was taught rather than only receiving it passively. Educationists who examined this method have described it as an important step within the overall teaching-learning process.

Application: The statement "The assignment method is an important step in teaching and learning process" is documented in teacher-education reference material as attributed to Douglas.

Cross-check: Checking the distractors against documented associations confirms Douglas as the intended source:

• Dewey is documented for experiential, "learning by doing" education and the broader project method -- a distinct framework from this specific statement.

• Piaget is documented for the theory of cognitive-development stages in children -- a developmental-psychology framework distinct from this specific statement.

• S. Morris carries no comparable documented framework or quotation on the assignment method in teacher-education reference material.

So among the given options, Douglas is the one whose documented association matches this statement about the assignment method.