develope a new material to be applied replacing the old material. New materials must be tested for several times to see the appropriateness of the materials.
2.2 Review of the Theoretical Study
This  second  section  gives  brief  descriptions  of  teaching-materials  development, definitions of autism, characteristics of autistic children, and teaching English for
autistic children.
2.2.1 Definition of Teaching-materials Development
As this study discusses about developing teaching-learning materials in teaching English  for  autistic  learners,  it  is  necessary  to  know  what  the  term  of
development and teaching-materials actually means in this study. To grab further understanding,  we  have  to  take  a  look  at  several  explanations  retrieved  from
several  references  about  the  terms.  According  to  Department  for  International Development: Learning and Teaching Materials Policy and Practice for Provision
2007 the term development is the act of developing or disclosing that which is unknown; a gradual unfolding process by which anything is developed, as a plan
or  method,  or  an  image  upon  a  photographic  plate;  gradual  advancement  or growth through a series of progressive changes; also, the result of developing, or
a  developed  state.  If  we  relate  this  term  with  teaching-materials,  then  it  means that the subject of the development itself is teaching materials. The term teaching
materials  based  on  DFID  2007  is  educational  resources  used  to  improve students’  knowledge,  abilities,  and  skills,  to  monitor  their  assimilation  of
information, and to contribute to their overall development and upbringing.
The existed materials are the raw source to be compared to the developed materials. In this proces some trials are needed to see the level of appropriateness
and the significance of the materials to get students’ attention and involvement. This relates to the question why are materials important in teaching language?
In his study, Allwright 1990 argues that materials should teach students to  learn,  that  they  should  be  resource  books  for  ideas  and  activities  for
instructionlearning,  and  that  they  should  give  teachers  rationales  for  what  they do.  From  Allwrights  point  of  view,  textbooks  are  too  inflexible  to  be  used
directly as instructional material. ONeill 1990, in contrast, argues that materials may be suitable for students needs, even if they are not designed specifically for
them,  that  textbooks  make  it  possible  for  students  to  review  and  prepare  their lessons,  which  textbooks  are  efficient  in  terms  of  time  and  money,  and  that
textbooks can and should allow for adaptation and improvisation. Materials here control the learning and teaching process.
An derived understanding about teaching materials development is about upgrading  the  content  of  the  materials  to  be  suited  to  the  objectives  of  the
learning  process  which  will  be  controlled  by  the  materals  designed  by  the developer.
2.2.2 Definition of Autism