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While analysis the financial crisis, there are many other factors which would have been reasons for financial crisis but in this research only main and important factors that led to financial crisis have been studied. The factors that are going to be used are important because various authors in professional and academic context have concluded these are main factors that effected financial crisis. There is no problem with the reliability and validity of the data collected as it is published by government. Only restriction in the analysis of financial crisis is analyzing different other factors.

2. Qualitative analysis of rating methodologies (moody's mortgage metrics): yearly (1999-2008) Moody's rating methodologies, rating process and rating review process have been analyzed. The data for the analysis have been collected from moody's website. This information has been published by moody's website as to prove transparency in the rating process. Rating methodologies, process of rating, review of rating procedures of Moody's have to be studied qualitatively.

As the data have been collected from Moody`s Investor services website, reliability and validity of the data cannot be questioned. The limitation is moody`s never completely disclosed their methodologies and sensitive parameters in the rating process. So to completely rely on data available Moody's website seems bit mistake but general idea of what is Moody's methodologies and rating process can be understood from this analysis. Incomplete disclosure is also one of the concerns raised by many authors as stated in professional and academic context, so we don't need to worry about it. Only aim of this analysis is to get in depth view of what is Moody`s rating methodologies and process. Few sensitive parameters which haven't been published will not affect the analysis process of the research to be done.

3. Qualitative analysis of updates to moody's mortgage metrics till 2008. The updates of Moody's methodologies in rating have been collected from moody's website. Qualitative analyses of these updates have to be done. The data collected from Moody's investors service is reliable and valid as it is published on Moody`s website itself. There is only one limitation as analysis is done on the data published. If Moody's have published all the updates the analysis would have been accurate. Immaterial of limitations the published updates can clearly be useful for the purpose of analysis.

4. Quantitative analysis of effects of these updates on default rate: Default rate which is consists of principal impairments, interest impairments, total impairments has to be analyzed whether it has effected by updates. Data for this analysis has been collected from moody's annual report of moodys Global Credit Ploicy on Default and loss rate of structured finance securities 2008. the analysis have to be done what effect did rating updates have on default rate. Finally conclusion have to be drawn from the analysis. The data source is reliable and accurate as the default rate data has been collected from Moody`s publication. The only limtation is about updates which has been discussed above.