Software Development Process

I would like someone to write the background of my research first , Talk about the software development process and the phases in general Second, Talk about the waterfall model and focus on the disadvantages of the model (Describe why we are not used) Second, Talk about RAD Model and and focus on the disadvantages of the model (Describe why we are not used) Third, Talk about Agile Model and and focus on the advantages of the model (Describe why we are used) Fourth, In Agile there are different approach 1-XP Talk about the XP model and focus on the disadvantages of the model (Describe why we are not used) 2-Scrum talk about the Scrum model and focus on the disadvantages of the model (Describe why we are not used) 3-Lean talk about the Lean model and focus on the disadvantages of the model (Describe why we are not used) 4-DSDM talk about the DSDM model and focus on the disadvantages of the model (Describe why we are not used) the last ting i want you to describe in background in our new methodology we combined between lean and DSDM (Talk in short why we combined because we already talk about this new methodology in methodology section ) Hints : We develop Emovie website (is a website for sharing video with rating) we are develop this website in a short period( 4 months) and our team of work we can not see others a lot in the week because all of us we are busy may be this info helps you when your write the advantages and disadvantage