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138  The Journal of the Royal Institute of Thailand Volume IV - 2012 Nouns: 1. Plural –s 2. Possessives –’s Verbs: 3. Third person SG non-past –s 4. Progressive -ing 5. Past tense – ed 6. Past particle - en / -ed Adjectives: 7. Comparative – er 8. Superlative - est The second step of the content analysis involved an examination of each type of in fl ection that is used in the English language in order to catalogue every possible environment. The examination began with the standard or regular processes and then went on to fi nd all of the variations or irregular processes that occur in relation to each type. This analysis resulted in a thorough and complete view of the fi eld of in fl ection in the English language and provided checklists for each category of English language in fl ection. 2. Data Collection The second part of the instrumentation was to fi nd all lexical occurrences for each type or environment and to classify them according to the process by which they are formed and to ascertain if that process is considered to be a regular or irregular variation. This step involved a survey of the vocabulary items involved with each variation or irregular occurrence, in order to fi nd which words can be considered as irregular for that particular environment. The purpose of these fi rst two steps was to collect data related to the research objective. The research data was collected by the following methods using a lexical analysis. They can be classi fi ed as below: 1) For English in fl ection analysis, the data was collected by recording into the checklists provided, according to each variation. There was a collection of the data from a number of different dictionaries, such as the Oxford Advanced In fl ections in English Nouns, Verbs, and Adjectives