Furthermore,  Hyland  2006  via  Upton,  2012:  7-8  gives  four  principal roles that materials play within language instruction as follows.
1 To  provide  language  scaffolding  in  order  to  support  learners’
understanding of how language is used. 2
To  serve  a  model  with  the  purpose  to  provide  examples  of  specific language features, structures or functions of the language being studied.
3 To  serve  a  stimulus in  order  to  encourage  students  to connect  with  their
experience, articulate their ideas, and interact with others. 4
To serve as a reference. It provides information about language instead of the practice. For example: dictionaries and grammars.
d. Criteria of Good Materials
In developing the materials, it is important to define some criteria of good materials.  According  to  Hutchinson  and  Waters  1987:  107-108  there  are
some criteria of good materials as stated below. 1
Materials provide a stimulus to learning. Good materials do not teach but instead  of  encouraging  learners  to  learn.  Good  materials  should  contain
interesting  texts,  enjoyable  activities  which  engage  learners’  thinking capacity,  opportunities  to  use  their  existing  knowledge  and  skills,  and
content which both learner and teacher can cope with.
2 Materials help to organize the teaching-learning process, by providing a
path  through  the  complex  mass  of  the  language  to  be  learnt.  Good materials  should  provide  a  clear  and  coherent  unit  structure  that  will
guide teacher and learner through various activities.
3 Materials  embody  a  view  of  the  nature  the  language  and  learning.
Materials  should  reflect  what  you  think  and  feel  about  the  learning process.
4 Materials reflect the nature of the learning task.
5 Materials  can  have  very  useful  function  in  broadening  the  basis  of
teacher training by introducing teachers to new techniques. 6
Materials provide models of correct and appropriate language use.
e. Materials Evaluation
Materials  evaluation  should  be  done  at  the  end  of  the  developing  the materials. I
t is to know whether the materials design meet the learners’ needs and  the  appropriateness  of  the  materials.  Some  experts  have  proposed
frameworks  for  materials  evaluation.  Cunningsworth  1995  in  Richards 2001:258 suggests four criteria for evaluating materials as follows.
1 They  should  correspond  to  learners’  needs.  They  should  match  the
aimsand objectives of the language learning programme. 2
They  should  reflect  the  uses  present  or  future  that  learners  make  of thelanguage.  Textbooks  should  be  chosen  to  help  equip  learners  to
uselanguage effectively for their own purposes. 3
They  should  take  account  of  students’  needs  as  learners  and shouldfacilitate their learning processes, without dogmatically imposing a
rigid‘method’. 4
They should have a clear role as a support for learning. Like teachers,they mediate between the target language and the learner.
Moreover, Tomlinson 1998:227-231 proposes the four steps are used to ensure that the evaluation is systemic and principled.
Table 2: Steps in Conducting an Evaluation of a Task Step 1
Description of the task: 1.
Contents  input,  procedures,  language activity
2. Objectives
Step 2 Planning  the  evaluation  with  references  to  the
dimensions
Step 3 Collecting information
Step 4 Conclusion and recommendations
5. Task Development
a. Definition of Task
Task is an aspect that should be considered in developing the materials. Nunan 2004 divided task into two categories; they are real-world or target
tasks and pedagogical tasks. The target tasks mean the uses of language in the world  beyond  the  classroom.  Meanwhile  pedagogical  tasks  mean  those  that
occur  in  the  classroom.  Accordance  with  the  theories  above,  Skehan  1998 via  Nunan  20014:3  proposes  five  key  characteristics  of  a  task  as  stated
below. 1
Meaning is primary. 2
Learners are not given other people’s meaning to regurgitate. 3
There is some sort of relationship to comparable real-world activities. 4
Task completion has some priority. 5
The assessment of the task is in terms of outcome. Finally,  Nunan 2004: 4 defines task as a piece of classroom work that
involves  learners  in  comprehending,  manipulating,  producing,  or  interacting in  the  target  language  while  their  attention  is  focused  on  mobilizing  their
grammatical  knowledge  in  order  to  express  meaning,  and  in  which  the intention is convey meaning rather than to manipulate form.
b. Components of Task
Nunan  2004  proposes  a  minimum  specification  of  task  that  should  be applied  in  developing  materials.  The  components  will  include  goals,  input,
and  procedures.  Those  components  will  be  supported  by  roles  and  settings. Every component has different function specification as proposed by Nunan
2004: 41-56.
Figure 3:  Diagram of tasks simple model by Nunan
Goal Input
Procedures TASK
Teacher’s role Learner’s role
Settings