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needs into three aspects: necessities, lacks, and wants.
1. Necessities
Necessities are the learners’ needs to know the knowledge demanded by target situations where learners are involved.
2. Lacks
Every  learner  have  problems  in  the  English  learning  such  as  the  lack  of proficiency,  vocabulary,  grammar,  and  it  is  possible  that  the  problem  varies
depend  on  the  each  student.  Lacks  are  defined  as  the  gap  occurs  between  the difficulties  and  the  necessities  by  Hutchinson    Waters  1987:  55-56.  When
learners  cannot  achieve  the  necessities  that  concern  demanded  knowledge,  lacks are things that need to be solved.
3. Wants
ESP  learners  also  can  determine  the  needs  by  their  own  out  of  the necessities. This refers to Wants in which learners are also given an opportunity to
be  active  in  deciding  the  needs  because  people  can  have  their  own  thought  that may be different from what the students are supposed to do.
As  stressed  by  Hutchinson  and  Waters  1987:  55  about  target  needs,  it can  be  concluded  that  to  determine  target  needs,  the  course  planner  should  take
three categories related to target needs analysis into account.
b.  Learning needs
After getting the whole picture of learners’ needs, there is an aspect  that should  be  considered  in  planning  an  ESP  course    is  learning  needs.  Hutchinson
and Waters 1987: 60 imply that learning needs is the route to achieve the goals
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and objectives set by the developer  from the starting points. Tahir 2011: 16-17 states  that  learning  needs  importance  is  equal  to  need  analysis.  Furthermore,  he
suggest  that  learning  needs  should  be  considered  more  important  than  need analysis by future ESP teachers.
In  summary,  learning  needs  is  also  as  important as  learners’  needs.
Because its nature is a “route”, ESP teachers need to take learning needs seriously
in planning and developing an ESP course in order to make ESP course become enjoyable, while still able to achieve its goals and objectives.
c.  Materials Development
The  next  step  after  getting  information  of  learners’  needs  and  learning needs  is  to  develop  the  materials.  Tomlinson  1998:  2  states  that  materials  are
anything  used  by  teachers  and  learners  to  achieve  the  learning  goals.  Related  to materials  development,  Nunan  1991:  216  states  that  material  development  is
basically  dealing  with  selection,  adaptation,and  creation  of  teaching  materials. According  to  Richards  2001:  86  teaching  materials  in  the  process  of  teaching
and  learning  has  functions  as  the  language  input  for  learners,  and  ideas  for teachers in planning and  teaching lessons. In line with this, Dudley-Evans and St.
John 1998 suggest that for teachers of ESP courses, teaching materials function as a source of language, learning support, for motivation and stimulation, and for
reference.