material / materials as nouns In your two examples, Steve, material and materials feature as part of compound nouns relating to the teaching of a school subject. It would always be plural in the first example, materialsdevelopment, because we are thinking of a range ofmaterials or of a large project which has many elements. In the second example, it could be singular or plural. We speak of both teaching material or teaching materials, depending on how narrowly or broadly we are thinking of them. Whether we use material in the singular or the plural depends on the context of use. When we are thinking of equipment or a number of things that you need for a particular activity, it could be used in the singular, but would normally be used in the plural: - The flat needed a good spring clean so I went out and bought lots of cleaning materials.
- I keep all my writing materials in a special compartment in my briefcase.
When material refers to ideas that you can use as a basis for an article, a book, a play or a film, it is normally used in the singular: - I found some useful material for my book on lifestyles in the Sunday papers.
- For his latest film, he wrote a good deal of the material himself.
Note that even when material is used in the singular here, it has a plural sense.

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