Methodologies...is the process you follow in your 
company....varys for company to company...usually same for 
all CMM Level's company.

Technologies...you should be aware of technologies present 
in your company.

Sumit,

   ur query is not clear.U r supposed to ask the MODEL
like(V-model or waterfall model).

I suggest all of u people in this community.Pls post the
queries clearly and understandable,so that it possible to
answer clearly by anybody.

Sorry if my suggestion hurt u people

There are various methodologies available for
developing and testing a software. The metholdogiy we choose
depends on factors like nature of the projects, the project
schedule, resource available and company standards.

       Methodology vary from company to company it is not
standard that we have to strictly follow either this or that
methodology.

     For CMM Level company--> Mostly they follow V-Model, XP
,prototype model and company created own models.
   prototype model when the clients ask us to show for each
and every phase before making original model ( like giving
sample model before developing which is costly for creating
sample itself).

      Moderate company--> They also go for V-model and
rarely v-model.

      Start up and below grade company--> they either go for
water fall model ( because of budget) and adhoc model ( no
process , it goes just without anything).

       Each and every methodology has indept of subject to
itself.
  ultimately what ever methodology we adapt our aim is to
test it  properly and give working product/ project.