1.   And an incoming government must encourage industry to use reclaimed materials - and back its drive with financial incentives if necessary.

2.   It had to be easy and cheap to build, maintain and operate in addition to using local materials where possible.

3.   It is for the teachers, drawing on their professional knowledge and expertise, to use the materials appropriate for their pupils.

4.   Many producers are being forced to cut costs and use cheaper materials.

5.   Only the one chosen background material has been used but it has been presented at various distances and angles.

6.   The ban is part of a campaign for a better environment and includes using recycled materials for packaging.

7.   The challenge in designing and using materials is how to delay the moment of ultimate failure.

8.   The experiment is also relevant to the possibility of mimicking shaded parts of a canopy by using materials of different colours.

9.   The film itself should not be written off just because it uses unsophisticated material.