Process Models

8 pages
2 views

Please download to get full document.

View again

of 8
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Share
Description
se models
Tags
Transcript
   PROCESS MODELS Assignment.1) WATERFALL MODEL 1)Waterfall model is a cascade SDLC model. )!n t is# de$elo%ment %rocess loo&s li&e t e flo'((mo$ing ste% * ste% t ro+g t e % ases of anal*sis# %ro,ecting# reali-ation# testing# im%lementation and s+%%ort. )!n 'aterfall model # one m+st %lan and sc ed+le all acti$ities efore strating 'or&ing on t em. /)T e % ases of 0T e Waterfall Model0 are Re2+irement anal*sis and design All re2+irements of t e s*stem ' ic as to e de$elo%ed are collected in t is ste%. Re2+irements a$e to e collected * anal*sing t e needs of t e c+stomer3 +sers and c ec&ing t em for $alidit* and t e %ossiilit* to im%lement t em. 4)S*stem DesignT e s*stem as to e %ro%erl* designed efore an* im%lementation is started. e soft'are com%onents a$e to e defined to meet t e end +ser re2+irements and to meet t e need of %ossilescalailit* of t e s*stem. 5)soft'are Design6ased on t e s*stem arc itect+re ' ic defines t e main soft'areloc&s t e soft'are design 'ill rea& t em f+rt er do'n into code mod+les. egstart+%# s +tdo'n# error conditions and diagnostic modes. 7)Coding 6ased on t e soft'are design doc+ment t e 'or& is aiming to set +% t e defined mod+les or +nits and act+al coding is started. T e s*stem is first de$elo%ed in smaller %ortions called +nits. Soft'are integration and 8erification Eac +nit is de$elo%ed inde%endentl*and can e tested for its f+nctionalit*. T is is t e 9):nit Testing. !t sim%l* $erifies if t e mod+les or +nits to c ec& if t e* meet t eir s%ecifications. S*stem $alidation After s+ccessf+ll* integration incl+ding t e related tests t e com%lete s*stem as to e tested against its initial re2+irements. ;)O%eration and maintenance T e s*stem is anded o$er to t e c+stomer#' o 'ill c ec& if is re2+irements 'ere im%lemented as e<%ected +t e 'ill also $alidate if t e correct re2+irements a$e een set +%. !n case t ere are c anges necessar* it as to e fi<edto ma&e t e s*stem +sale or to ma&e it com%l* to t e c+stomer 'is es. AD8A=TA>ES 1)T is model is sim%le and eas* to +nderstand# to im%lement# and +se. )!t a$oids o$erla%%ing of % ases eca+se eac % ase is com%leted at once. )All t e re2+irements are &no'n at t e eginning of t e %ro,ect# ence it is eas*to manage. /)T is model 'or&s for small %ro,ects ' ere t e re2+irements are easil* +nderstood. 4)e$er* % ase as a defined res+lt and %rocess re$ie'. 5)De$elo%ment stages go one * one. 7)Wor&s 'ell ' en 2+alit* is more im%ortant t en cost3sc ed+le. 9)C+stomers3End +sers alread* &no' ao+t it. D!SAD8A=TA>ES 1)!m%ortant t ings is to gat er all %ossile re2+irements d+ring t e first % ase of re2+irements collection and anal*sis. !f not all re2+irements are otained at once t e s+se2+ent % ases 'ill s+ffer from it.Realit* is t at onl* a %art of t e re2+irements is &no'n at t e eginning and a certain %ercentage 'ill e gat ered d+ring t e com%lete de$elo%ment time. )T e soft'are is read* onl* after t e last stage is o$er.   )not m+c s+itale for t e long(term %ro,ects. /)T e %rogress of t e stage is ard to meas+re ' ile it is still in t e de$elo%ment. 4)!n t is#t e c anges are not %ermitted so it is not fit for moderate to ig ris&c anges in %ro,ect. 5)T e %rolems 'it t is model are +nco$ered# +ntil t e soft'are testing. 7)T e amo+nt of ris& is ig .) SP!RAL MODEL 1)T e s%iral model is same as to t e incremental model# 'it more ig lig tingon ris& anal*sis. )T e model is di$ided in fo+r % ases Planning# Ris& Anal*sis# Engineering and E$al+ation )!t loo&s li&e a s%iral 'it man* loo%s. /)T e e<act n+mer of loo%s of t e s%iral is +n&no'n and can $ar* from %ro,ect to %ro,ect. 4)Eac loo% of t e s%iral is called a P ase of t e soft'are de$elo%ment %rocess. 5)E$er* % ase in t e S%iral model is start 'it a design goal and ends 'it t e client re$ie'. 7)Planning % aseT is % ase collects t e re2+irements for contin+o+s comm+nicationet'een t e c+stomer and s*stem anal*st. !t in$ol$es estimating t e cost and reso+rces for t e iteration. 9)Ris& Anal*sisT is % ase identifies t e ris& and %ro$ides t e alternate sol+tions if t e ris& is fo+nd. ;)Engineering % ase !n t is % ase# act+al de$elo%ment i.e coding of t e soft'are is com%leted. Testing is com%leted at t e end of t e % ase. 1?)E$al+ation % ase  in t is# soft'are gets e$al+ated * t e c+stomers. T e* %ro$ide t e feedac& efore t e %ro,ect contin+es to t e ne<t s%iral. AD8A=TA>ES 1)!t is good for large and critical %ro,ects. )!t red+ces ig amo+nt of ris&. )C ange re2+ests in t e Re2+irements at later % ase can e done acc+ratel* * +sing t is model. /)C+stomer can see t e de$elo%ment of t e %rod+ct at t e earl* % ase of t e soft'are de$elo%ment. 4)De$elo%ment can e di$ided in to smaller %arts and more ris&* %arts can e de$elo%ed earlier ' ic el%s etter ris& management. D!SAD8A=TA>ES 1)S%iral Model is not s+itale for small %ro,ects as it is e<%ensi$e. )As t e n+mer of % ases is +n&no'n at t e start of t e %ro,ect# so time estimation is $er* diffic+lt. )T e S%iral Model is m+c more com%le< t an ot er SDLC models. /)!t can e costl* to de$elo% a soft'are model. 4)6ig n+mer of t e intermediate stages re2+ires e<cessi$e doc+mentation.) 8(MODEL 1)T e 8(model model is an e<tension of t e 'aterfall model. )8 model is &no'n as 8erification and 8alidation model. )!t is a t*%e of SDLC model ' ere %rocess e<ec+tes in a se2+ential manner in 8(s a%e. /)De$elo%ment of eac ste% directl* associated 'it t e testing % ase.   4)T e ne<t % ase starts onl* after com%letion of t e %re$io+s % ase.i.e E$er* % ase com%letes its e<ec+tion efore t e e<ec+tion of ne<t % ase egins. 5)%rocesses are e<ec+ted se2+entiall*. 7)% ases of $ model are Re2+irements T e re2+irements of %rod+ct are +nderstood from t e c+stomers %oint of $ie' to &no' t eir e<act re2+irement and e<%ectation. 9)S*stem Design ig le$el design of t e soft'are is constr+cted. ;)Arc itect+re design T e mod+le relations i% and de%endencies of mod+le# arc itect+ral diagrams# dataase tales# tec nolog* details are com%leted in t is % ase. 1?) Mod+le design Se%aratel* design e$er* mod+le or t e soft'are com%onents.:nit tests are t e $ital %art of an* de$elo%ment %rocess. T e* el% to remo$e t e ma<im+m fa+lts and errors at an earl* stage. 11)Coding P ase T e act+al code design of mod+le designed in t e design % ase is graed in t e coding % ase. AD8A=TA>ES 1)Sim%le and eas* to +nderstand and +se. )8(Model is +sed for small %ro,ects ' ere %ro,ect re2+irements are clear. )Man* testing acti$ities i.e %lanning# test design are e<ec+ted in t e starting and ence it sa$es more time. /)Calc+lation of errors is done at t e starting of t e %ro,ect ence# less c ances of error occ+rred at final % ase of testing. 4)E$er* stage of 8(s a%ed model as strict res+lts so it@s eas* to contrl. D!SAD8A=TA>ES 1)Lac& of t e fle<iilit*. )8(model is not s+itale for large and com%osite %ro,ects. )!f t e re2+irements are not constant t en t is model is not acce%tale. /)ig ris& and +ncertaint*. 4)!t is not a good for com%le< and o,ect(oriented %ro,ects. /) !=CREME=TAL MODEL 1)T e incremental model comines t e elements of 'aterfall model and t e* are a%%lied in an iterati$e fas ion. )T e first increment in t is model is generall* a core %rod+ct. )!n t is model#eac increment +ilds t e %rod+ct and s+mits it to t e c+stomer for s+ggesting an* modifications. /)T e ne<t increment im%lements t e c+stomerBs s+ggestions and add additional re2+irements in t e %re$io+s increment. 4)T is %rocess is re%eated +ntil t e %rod+ct is com%leted. 5)T e % ases of !ncremental model Comm+nication  T e soft'are de$elo%ment starts 'it t e comm+nication et'een c+stomer and de$elo%er. 7)Planning !t consists of com%lete estimation# sc ed+ling for %ro,ect de$elo%ment. 9)Modeling !t consists of com%lete re2+irement anal*sis and t e design of t e %ro,ect li&e algorit m# flo'c art etc. ;)Constr+ctionConstr+ction consists of code generation and t e testing %art.Testing is to c ec& ' et er t e flo' of coding is correct or not. 1?)De%lo*ment De%lo*ment ste% consists of deli$ering t e %rod+ct to t e c+stomer and ta&ing feedac& from t em. AD8A=TA>ES 1):ses di$ide and con2+er for rea&do'n of tas&s. )Lo'ers initial deli$er* cost.   )!ncremental Reso+rce De%lo*ment. /)T is model is fle<ile eca+se t e cost of de$elo%ment is lo' and initial %rod+ct deli$er* is faster. 4)!t is easier to test and de+g in t e smaller iteration. 5)Error Red+ction. D!SAD8A=TA>ES 1)Re2+ires good %lanning and design. )Well defined mod+le interfaces are re2+ired. )Total cost is not lo'er.T e cost of t e final %rod+ct ma* cross t e cost initiall* estimated. /)T e demands of c+stomer for t e additional f+nctionalities after e$er* incrementca+ses %rolem in t e s*stem arc itect+re.4) !TERAT!8E MODEL 1)n !terati$e model# t e large a%%lication of soft'are de$elo%ment is di$ided intosmaller c +n&s and smaller %arts of soft'are ' ic can e re$ie'ed to recogni-e f+rt er re2+irements are im%lemented. )!t generates a ne' $ersion of t e soft'are in eac c*cle of a model. )Wit e$er* iteration# de$elo%ment mod+le goes t ro+g t e % ases /) P ases are re2+irement# design# im%lementation and testing. 4)T e !terati$e model does not need t e f+ll list of re2+irements efore t e %ro,ect starts. 5)T e %rocess is re%etiti$e# allo'ing to ma&e ne' $ersions of t e %rod+ct for e$er* c*cle. 7) !t a%%lies t e %arallel de$elo%ment. AD8A=TA>ES 1)T e %aralleled de$elo%ment can e a%%lied. )Prod+ces 'or&ing soft'are ra%idl* and earl* in t e soft'are life c*cle. )T is model is eas* to test and de+g in a smaller iteration. /)!t is less costl* to c ange sco%e and re2+irements. 4)Fle<iilit* and readiness to t e c anges in t e re2+irements. 5)!t is easier to control t e ris&s as ig (ris& tas&s are com%leted first. D!SAD8A=TA>ES 1)!terati$e model re2+ires more reso+rces t an t e 'aterfall model. )T e %rocess is diffic+lt to manage. )T e s*stem arc itect+re is costl*. /)T e ris&s ma* not e com%letel* determined e$en at t e final stage of t e %ro,ect. 4)Constant management is re2+ired.5) Agile Model 1)Agile de$elo%ment is one &ind of iterati$e and !ncremental de$elo%ment model. )!n t is#t e increments are small and t*%icall*# ne' releases of t e s*stem are created and made a$ailale to c+stomers e$er* fe' 'ee&s. )T is model foc+ses on t e +sers satisfaction ' ic can e ac ie$ed 'it 2+ic& deli$er* of t e 'or&ing soft'are %rod+ct. /)Agile model rea&s t e %rod+ct into indi$id+al iterations. 4)Wit e$er* increment# feat+res are incremented and t e final increment old all t e feat+res needed * t e c+stomers. 5)T e c+stomer is ale to see t e res+lt and +nderstand if e is satisfied 'it itor not. 7)E<treme %rogramming is one of t e %ractical +se of t e agile model. 9)T e asis of s+c model consists of s ort 'ee&l* meetings.
Related Search
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks