# Explore PT sources

**URL:** <https://forum.code.org/t/explore-pt-sources/23156>\
**Category:** CS Principles\
**Created:** [December 6, 2018, 4:30pm UTC](https://forum.code.org/t/explore-pt-sources/23156 "2018-12-06T16:30:32Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![almanm](https://avatars.discourse-cdn.com/v4/letter/a/3e96dc/32.png) [@almanm](https://forum.code.org/u/almanm)\
**Post date:** [December 6, 2018, 4:30pm UTC](https://forum.code.org/t/explore-pt-sources/23156/1 "2018-12-06T16:30:32Z")

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Good morning,  
The Explore PT says students must use 2 sources dated after the previous academic year. Does that mean anything after the Spring of 2018, or would slightly older sources be ok if they were at least published in 2018? Thanks.  
–Matt

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**Author:** ![frank\_w\_lee](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/frank_w_lee/32/4895_2.png) [@frank\_w\_lee](https://forum.code.org/u/frank_w_lee)\
**Post date:** [December 8, 2018, 6:33am UTC](https://forum.code.org/t/explore-pt-sources/23156/2 "2018-12-08T06:33:16Z")

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Hi @almanm,

Short answer - the “previous academic year” ends after April of the previous calendar year. That means a source is considered recent enough if it’s dated May 2018 or later.

Source: [https://apcentral.collegeboard.org/courses/ap-computer-science-principles/course/frequently-asked-questions/the-explore-performance-task-directions-indicate-least-two-sources-must-have-been-created?course=ap-computer-science-principles](https://apcentral.collegeboard.org/courses/ap-computer-science-principles/course/frequently-asked-questions/the-explore-performance-task-directions-indicate-least-two-sources-must-have-been-created?course=ap-computer-science-principles)

Frank

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**Author:** ![christopher.klusewit](https://avatars.discourse-cdn.com/v4/letter/c/f04885/32.png) [@christopher.klusewit](https://forum.code.org/u/christopher.klusewit)\
**Post date:** [January 17, 2019, 4:52pm UTC](https://forum.code.org/t/explore-pt-sources/23156/3 "2019-01-17T16:52:44Z")

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Do sources that have been updated after May 2018 count as well?

I have seen some online sources that have been published several years ago but have been updated after May 2018. Are students able to use this?

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**Author:** ![bhatnagars](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/bhatnagars/32/4919_2.png) [@bhatnagars](https://forum.code.org/u/bhatnagars)\
**Post date:** [January 17, 2019, 5:06pm UTC](https://forum.code.org/t/explore-pt-sources/23156/4 "2019-01-17T17:06:22Z")

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I would think yes as long as it says so in the article!

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**Author:** ![christopher.klusewit](https://avatars.discourse-cdn.com/v4/letter/c/f04885/32.png) [@christopher.klusewit](https://forum.code.org/u/christopher.klusewit)\
**Post date:** [January 18, 2019, 5:41pm UTC](https://forum.code.org/t/explore-pt-sources/23156/5 "2019-01-18T17:41:45Z")

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Thank you for your response!

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**Author:** ![frank\_w\_lee](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/frank_w_lee/32/4895_2.png) [@frank\_w\_lee](https://forum.code.org/u/frank_w_lee)\
**Post date:** [January 20, 2019, 1:46am UTC](https://forum.code.org/t/explore-pt-sources/23156/6 "2019-01-20T01:46:54Z")

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I believe the intention of the “recent article” rule is that CB is trying to keep the innovations something current, not what was considered an innovation 10 years ago. They then define current as something that’s still being talked about, something that’s in the news. By my interpretation (including all the zero authority I have), an updated article seems to be in the spirit of currentness.