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[Music] welcome to another history skills video today we're looking at corroboration of sources when you are analyzing a historical source it is helpful to discover what information it provides when compared with other sources about the same topic finding similarities between multiple sources can be used in your assessment pieces to demonstrate corroboration most importantly corroboration is an analysis skill that helps you to more successfully evaluate your sources especially in regards to their accuracy so what is corroboration corroboration is the ability to compare information provided by two separate sources and identify similarities between them when a source provides similar information to another source the second source is considered to corroborate the first please note that both sources don't need to use exactly the same words in order to corroborate they can express the same information in different ways and still be used for corroboration for example one source might say that a historical personality died before they turned 40 years old while another source might say that the same person died sometime after their 36th birthday even though these two sources express the same idea in two different ways what is similar is that both sources state that the person died in their late-30s therefore ensure that you read your sources carefully to find information that is similar even if it is expressed in different ways once you have mastered the skill of identifying corroborating sources you can use it to strengthen your historical arguments particularly in your written essays as a general rule of thumb when choosing which sources to corroborate select those that are the most reliable which will strengthen your historical argument so how do you find corroboration in order to identify what information is agreed upon by two different sources use the following steps step 1 read the first source and summarize the key points of historical information it provides using quotes particularly in direct quotes will be helpful for this secondly read the second source and summarize the key points of historical information it provides again using direct and indirect quotes will help here thirdly compare the two different summaries you have written and identify similar information in both lists please remember that different sources can express the same information in different ways step 4 any similar information can be used as evidence for corroboration finally choose which of the two sources you'll use as your original evidence and use the other one as the corroborating source for what happens when you find two sources provide conflicting information while finding similarities between sources you may find that the two provide information that conflict with each other on such occasions you may have discovered potential contradiction between sources however contradiction is a different source analysis skill which will be covered in a separate video now that you know what corroboration is and how to identify it let's look at an example to solidify your learning our example sources will come from 1917 during the World War 1 Battle of Passchendaele the first source is written by Thomas and eyewitness of the battle who describes a weather conditions of the conflict as follows floods of rain and a blanket of mist have doused and cloaked the whole of the Flanders plain the newest shell holes are now flooded to the brim the rain has so failed this low stone 'less ground spoiled of all natural drainage by shellfire the men could scarcely walk in full equipment the second source also comes from someone who saw the events firsthand this time a soldier known as Philips describes the same battle in this way the weather change for the worst last night the rain was heavy and constant with a thick blanket of mist completely shutting off the battlefield the roads fields and foot ways were covered with semi-liquid mud and the torn ground beyond Ypres had become in places a horrible quagmire when read together it is clear that even though they use different words the two sources describe the weather conditions in very much the same way therefore one source can be used to corroborate the information of the other source for this example we can use Philips account to corroborate Thomas's description that the battlefield of Passchendaele was flooded due to heavy rainfall now you have a better understanding of cooperation I hope that you feel more confident in your studies if you need further explanations examples and advice head over to history skills comm and I'll see you next time