The following resources contain additional information on SDLC. Please use them to get more in-depth knowledge on this.
Software Testing Tutorial − This tutorial will give you basic understanding on software testing, it's types, methods, levels and other related terminologies.
SDLC on Wikipedia − Brief explanation of Software Development Life Cycle on Wikipedia.
Agile Software Development on Wikipedia − Different concepts are explained under this link.
Agile - Another useful website for Agile
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