This Agile Life: Recent Episodes
John Sextro
Items necessary for "Minimum Viable Airlines" and your "Minimum Viable Project". These are the items that we agreed we would need before embarking on a project together. Do you have all of these before you begin a project? Destination - Project Vision Altitude - Depth of backlog Location - Progress (working software) Airspeed - Speed of delivery and speed constraints Fuel - Stories Captain or pilot - A leader Black box - Project data or metrics Landing gear - A clear and well worn path to prod Good flight procedures - Working agreements FAA flight time restrictions for pilots - Sustainable pace Logbook - Source control Emergency slide - Good enough or a safe way to end a project on short notice Picks Jason Podcasting Innovation - it’s amazing how much has changed in the last 7+ years, thanks to all the people & companies that have created Goats to Go - www.goatsonthego.com - you can poop out the back of the airplane The Red Rubber Ball at Work - by Kevin Carroll - a fun book on practical strategies and why you should inject more fun into the workplace - http://kevincarrollkatalyst.com/books TV shows you can watch that Jason likes: Why Planes Crash Airline Repo John Uncle Bob, professionalism in software development and the future of programming, https://youtu.be/LmRl0D-RkPU Craig Waverunners Vacation from your vacation China Airlines Flight 006, https://en.wikipedia.org/wiki/ChinaAirlinesFlight_006 Nuclear and radiation accidents and incidents, https://en.wikipedia.org/wiki/Nuclearandradiationaccidentsand_incidents
Join the guys as they, on the fly, create the Developer Experience Manifesto Picks Jason Book - “Exactly What to Say: The Magic Words of Influence & Impact” by Phil Jones - great insights and straights on how many of the simple things we say (including on this podcast) impact how people perceive and respond to what we say as agilists - https://www.philmjones.com/exactly/ Product (for virtual teams) Sococo - Provides a virtual office with different spaces for team collaboration, pairing, or solo work - creates the experience where people working virtually can drop in - www.sococo.com Live Event - Agile Midwest 2019 - Come hang out in the “Agile Lounge” to discuss advanced agile topics or attend any of the other 40+ sessions on the program - www.agilemidwest.org John Three Amigos, https://www.imdb.com/title/tt0092086/ WWT Software Development podcast episode on the Virtual Office, https://wwtapps.podbean.com/e/virtual-office-1563125261/ John's relatively new podcast, Dalio's Principles: A Philosophical Examination, https://daliosprinciples.fireside.fm/
Scaled Agile and the similarities between hair styling and agilist. The Picks Craig New version of git, introducing git switch and git restore: https://github.blog/2019-08-16-highlights-from-git-2-23/ Lee Pros and Cons of Scaled Agile https://www.qasymphony.com/blog/pros-cons-scaled-agile-framework-safe/ Amos Rocketbook Beacons https://getrocketbook.com/pages/beacons-how-it-works John https://daliosprinciples.fireside.fm/ My new podcast Dalio’s Principles: A Philosophical Examination
In this thrilling episode of This Agile Life, Jason asks for advice from Craig, Amos and Lee on what kind of metrics development teams can provide so there is some level of predictability as to new when features will be available to users or potential customers. Craig I Estimate this Talk will be 20 Minutes Long, Give or Take 10 Minutes by Noel Rappin, https://www.youtube.com/watch?v=jBMwT53oGsM Concolic testing, https://en.wikipedia.org/wiki/Concolic_testing * Concolic = concrete + symbolic Lee
NoEstimates Project Planning Using Monte Carlo Simulation, https://www.infoq.com/articles/noestimates-monte-carlo/
ActionableAgile, https://actionableagile.com/ Amos Agile and Beyond - Tom Churchwell, http://agileandbeyond.com Code Craftsman Saturdays - Bob Allen, http://codecraftsmansaturdays.blogspot.com Ford Agile Coaches - They are hiring agile craftsman who want to pair and do TDD email Fadi at fkhoury@ford.com Give and Take - Adam Grant, https://www.adamgrant.net/give-and-take Jason Book - Lynn Cazaly - Visual Mojo – Learn how drawing can be easy and fun & Agile 2019 keynote speaker - https://www.amazon.com/Visual-Mojo-Express-Lynne-Cazaly/dp/0987462911 Video - Brene Brown – Netflix Special: Call to Courage – Learn how shame and vulnerability impact you and your team and what you can do about it – https://www.netflix.com/title/81010166 Event - Agile Midwest Call For Papers Round Two (Sept 25/26 in St. Louis, MO) – Congrats to our first round selections but it’s not too late to submit your idea to share OR improve your submission if you weren’t selected – www.agilemidwest.org
Topics Marriage Workshop Skinny Agile Commandments: Working software, delivered in short intervals (weekly or more often) Every story has to be deployed when it’s finished Every story has to be valuable (to the stakeholders) and observable Picks Craig Jessica Kerr’s talk about Opera at Agile: Deliver, https://www.agilealliance.org/resources/sessions/the-origins-of-opera-and-the-future-of-programming-jessica-kerr/ John This is 40, https://www.imdb.com/title/tt1758830/
Jason and Amos in a steel cage match of death. Picks Tice Live Event - Play For Agile NA - September 26 - 29, 2019 - Corwall, ON - Multi-Day Open Space conference focused on collaboration for high performing teams - theme this year is: Growing Empathy through Play - https://play4agilenorthamerica.com/ Elevation of Privilege - Card Game for Threat Modeling - Open Source thanks to Microsoft - Model Your Threats - https://www.microsoft.com/en-us/download/details.aspx?id=20303 Amos GigCity Elixir - October 17-19, Chattanooga, TN, https://www.gigcityelixir.com/ Property-Based Testing with PropEr, Erlang, and Elixir: Find Bugs Before Your Users Do by Fred Hebert, https://pragprog.com/book/fhproper/property-based-testing-with-proper-erlang-and-elixir Behind Human Error by a bunch of people, https://www.amazon.com/Behind-Human-Error-David-Woods/dp/0754678342
What to do when team members don’t want to follow the established team rules? How to deal with your emotions getting the better of you? How Craig prefers to work * Introverted, but likes to work with people * Thinking out loud * OK with taking criticism in public * Passive with ideas The only thing you can control is how you act/react (Amos has been seeing this, but Tice brought it up) Team-first development (https://www.teamfirstdevelopment.com/) Vulnerability stories * Five Dysfunctions of a Team * The Advantage * Lead or Go First Tice’s advice on building trust * Share appreciation - more important than sharing constructive feedback (just appreciation & thank you) * Listen * Assume positive intent - assume that others are not out to get you * Share / Transparency Picks Tice * Agile Midwest 2019 - www.agilemidwest.org - Call for Awesome Sessions - now open - come share your ideas, help others learn, receive feedback and be part of the agile community. * Team exercise to learn how to work together better - Jason Lankow - https://medium.com/@jasonlankow/how-to-do-the-best-work-with-these-4-creative-types-5bf366a08f9c Amos * Ballast Point - Grapefruit Sculpin IPA * http://www.thelittletyper.com/ Craig * Single-Site Browsers (SSBs) * Coherence Pro (https://www.bzgapps.com/coherencepro) * Unite 2 (https://www.bzgapps.com/unite) * Fluid (https://fluidapp.com/)
How to tell how well your team is doing * Happiness * Productivity * Informed (communication) * Needed a break? * Learned/improved? * How many times did you feel pain? * Trust * Feeling important/useful * Self-organizing * Have you tried “all” the Agile practices? * Amos: team complains about chairs https://labs.spotify.com/2014/09/16/squad-health-check-model/ Picks John * Empathy Map exercise, https://www.solutionsiq.com/resource/blog-post/what-is-an-empathy-map/ Lee * Plickers - App for doing live anonymous polls, https://get.plickers.com/ Craig * TCR (test && commit || revert) - article by Kent Beck, https://medium.com/@kentbeck_7670/test-commit-revert-870bbd756864
Picks John * test && commit || revert with Kent Beck on https://hanselminutes.com/663/test-commit-revert-with-kent-beck * GTD, for $1.99 https://www.amazon.com/Getting-Things-Done-Stress-Free-Productivity-ebook/dp/B00KWG9M2E Amos * GullyTown Double Barrel Aged by Restless Spirits in Kansas City * A Philosophy of Software Design by John Ousterhout * Elixir Outlaws - https://elixiroutlaws.com
Picks Craig * A critique of “the 5 whys” (https://www.kitchensoap.com/2014/11/14/the-infinite-hows-or-the-dangers-of-the-five-whys/) (not the one I saw recently, but similar) * Office Space scenes with the real Michael Bolton (https://www.youtube.com/watch?v=03lrL9CFWxM) * Alchian-Allen effect (https://en.wikipedia.org/wiki/Alchian%E2%80%93Allen_effect) Amos * People * Paper * Getting Things Done (https://www.amazon.com/Getting-Things-Done-Stress-Free-Productivity/dp/0142000280) - David Allen
Links Agile Connection (https://www.agileconnection.com/question) Subway Map to Agile Practices (https://www.agilealliance.org/agile101/subway-map-to-agile-practices/) Picks Craig Doug DeMuro car videos (https://www.youtube.com/channel/UCsqjHFMB_JYTaEnf_vmTNqg) Auto Trader column called Oversteer Music without lyrics, but that I like 2Cellos (https://www.youtube.com/channel/UCyjuFsbclXyntSRMBAILzbw) Harp Twins (https://www.youtube.com/user/CamilleandKennerly) Lee Agile Connection (https://www.agileconnection.com) Bonus pick not mentioned in the show (http://dilbert.com/strip/2018-01-22) John 2017 Top 66 Developer Resources (https://hackernoon.com/the-top-66-developer-resources-from-2017-e82531365e6d) Agile Coalition (https://coalition.agileuprising.com/)
Special Guests Don Peters Marc Chouinard Topics Real-Time Team Improvements Setting Clear Objectives, Goals, and Working Agreements Try Pair Testing in 2018 Find Your Personal Impact / Motivation Picks Liftoff (https://www.amazon.com/Liftoff-Start-Sustain-Successful-Agile/dp/1680501631/) (Book) by Diana Larsen & Ainsley Nies – provides specific methods for “agile chartering” to help teams define their vision, and then write mission and mission tests to guide activities supportive of the vision Mile High Agile 2018 (https://www.milehighagile.org/) (Live Event) – Inspired by being in Denver, consider checking out the annual Mile High Agile conference being held in Denver, CO on May 21 & 22, 2018 – great conference with open space to learn from others Don’t just attend a conference, go present at it (Personal Development) – If you’ve attended a conference before, consider getting involved by presenting a session at a 2018 conference somewhere – lots of call for papers are open this time of year (early 2018), so consider helping improve the agile community by sharing what you know in 2018 – if you wait ‘til next year, you’ll only be another year older! Links Stop Work Authority Card (https://medium.com/@JoshuaKerievsky/stop-work-authority-d853f6a3c42d)
Topics Leadership by example Picks Craig Clean Architecture (https://www.amazon.com/Clean-Architecture-Craftsmans-Software-Structure/dp/0134494164) by Robert “Uncle Bob” Martin Building Evolutionary Architectures (https://www.amazon.com/gp/product/1491986360/) by Neal Ford and Rebecca Parsons John The Mother of All Demos (https://youtu.be/r6iADUTlqwQ), presented by Douglas Engelbart 1968 The Five Dysfunctions of a Team (https://smile.amazon.com/Five-Dysfunctions-Team-Leadership-Fable/dp/0787960756/ref=sr_1_sc_1?ie=UTF8&qid=1508296754&sr=8-1-spell&keywords=five+dystfunctions) Jason Liberating Structures (http://www.liberatingstructures.com) - helpful and well designed frameworks for specific types of strategic conversations - references available on the web at plus a Mobile App and also in print. LIVE EVENT - Imposter Syndrome: Innovation Killer Among Us (https://www.eventbrite.com/e/imposter-syndrome-innovation-killer-among-us-tickets-38074391530) - Wednesday morning, November 8, 2017 in the Kansas City area - Join Billie Schuttpelz after the Lean Agile KC conference to recreate the audacious salon experience from Agile2017 and learn more about Imposter Symdrome and how it impacts all of us.
Discussion The standardization of agile process across an organization. Picks Lee 22 Scrum Master Anti-Patterns (http://www.101ways.com/22-scrum-master-anti-patterns-job-ads/) from Job Ads, blog post by Stefan Wolpers Nate Mellowcreme pumpkins (https://en.wikipedia.org/wiki/Candy_pumpkin) The Greatest Generation (http://www.maximumfun.org/shows/greatest-generation) Amos (channeling Tice) ACM Code of Ethics and Professional Conduct (https://ethics.acm.org/) How a Raccoon Became an Aardvark (https://www.newyorker.com/tech/elements/how-a-raccoon-became-an-aardvark) Deep Teases ;-) John WASD Keyboards (http://www.wasdkeyboards.com)
The Discussion We discuss ways that you can create a virtual "Save Point" in your project, both technically and with your relationships. Picks Nate Audible Content Exchange (http://acx.com) Lee Welcome Inn Manor (http://welcomeinnmanor.com/) - B&B in Chicago Jason Jason’s Recommended Bed & Breakfast in Boulder, CO - The Alps Canyon Inn (http://www.alpsinn.com/) - (Lee thinks they have great bathtubs) - http://www.alpsinn.com/ Let’s Be Awesome (https://www.slideshare.net/JasonTice/lets-be-awesome-big-apple-scrum-day-2017-game-objective-guide) - a collaboration framework to guide recurring team/customer conversations to prioritize needs, practices to support them, and metrics to determine effectiveness - LIVE EVENT - Lean-Agile Kansas City (http://2017.leanagilekc.com/) - Nov 7, 2017 - Troy Magennis will be keynoting - Join us to celebrate long live #NoEstimates in Kansas City, MO John Factorio (https://www.factorio.com)
Picks Amos Moon Monkey - Ginger Beer from Saint Louis’ Urban Chestnut Quixir (https://hex.pm/packages/quixir) - Property-based testing in Elixir Lee Artillery (https://artillery.io/) - performance testing tool Testing Pyramid (https://martinfowler.com/bliki/TestPyramid.html) - from Martin Fowler Craig Ansible (https://www.ansible.com/) Server builds/configs My server configs (https://github.com/boochtek/server_config) Linux or macOS software install/configuration My macOS configs (https://github.com/boochtek/mac_config/tree/ansible) Puppet (https://puppet.com/) is also acceptable Chef (https://www.chef.io/chef/) is also acceptable Approval testing (http://approvaltests.com/) Previous This Agile Life on Approval Tests (http://www.thisagilelife.com/46) John Xkcd-1205 (https://xkcd.com/1205/) Low Orbit Ion Cannon (https://en.wikipedia.org/wiki/Low_Orbit_Ion_Cannon)
Links Maslow’s Hierarchy Needs (https://en.wikipedia.org/wiki/Maslow%27s_hierarchy_of_needs) Picks Jason The DevOps Lego Chocolate Game (https://www.agilealliance.org/resources/sessions/introduction-to-devops-with-chocolate-lego-and-scrum-game/) - a great way to learn about DevOps practices and how to apply them on your team Team First Development (http://www.teamfirstdevelopment.com/) - 3-minute Improv games to improve team dynamics, collaboration and communication - all the essentials to have a great team Live Event - Agile Midwest 2017 - Join @theagilefactor at the Midwest’s Largest non-profit agile conference - check out our program of 40 agile talks and a keynote by Tricia Broderick (Conference Chair for Agile2017) on growing leadership - conference sessions are held on Thursday, October 12, 2017 & be sure to attend Open Space, facilitated by @theagilefactor, on Wednesday, October 11, 2017 - Register at: https://www.agilemidwest.org/ Lee Talk (https://blog.mozilla.org/blog/2017/09/06/mozilla-washington-post-reinventing-online-comments/) - Mozilla’s attempt to bring back civil conversation to the Internet Amos Missouri Mule - IPA from Piney River Brewing Company Nerves (https://hexdocs.pm/nerves/getting-started.html) - embedded development in Elixir Strange Loop (https://www.thestrangeloop.com/index.html) SEPTEMBER 28-30 2017
Recorded at the Rolla Brewpub (http://www.publichousebrewery.com/rolla-brewpub/) Amos and Craig head out to a Brewery...Yes, a Brewery, and talk Josh Stacy, one of the co-owners of Public House Brewing Company. They talk about learning from our mistakes, continuous improvement, scaling, producing quality, and, of course, making beer. Picks Craig Being Employed
Amos
Farmhouse Ale (http://www.publichousebrewery.com/the-beer/)
Josh
Voltron (https://www.netflix.com/title/80075595)
Working from Home / Pairing Suggests on how to pair Mob Programming Picks Amos Maltopia, Hermitage Brewing (https://hermitagebrewing.com/beer/year-round/maltopia-scotch-ale/) Strange Loop (https://www.thestrangeloop.com/) ElixirConf (https://elixirconf.com/) Elixir Rocks Craig Ruby Conf (http://rubyconf.org/)
Job Interviews Hiring without Whiteboards (https://github.com/poteto/hiring-without-whiteboards) The Utter Uselessness of Job Interviews (https://www.nytimes.com/2017/04/08/opinion/sunday/the-utter-uselessness-of-job-interviews.html) from the New York Times John Krewson (https://twitter.com/johnkrewson) - Casting Casting Casting Craig's standard interview questions (https://github.com/boochtek/checklists/blob/master/Interview-Questions.md) Picks Craig 99 Bottles of OOP (https://www.sandimetz.com/99bottles/) by Sandi Metz and Katrina Owen I’ll be giving a workshop at Agile Alliance Technical Conference (https://www.agilealliance.org/agile-alliance-technical-conference-2017/) Smaller! - refactoring, story splitting, shorter iterations Amos Live Like a Hippy (https://www.youtube.com/watch?v=4Pswied02o0) - My Elixir Daze (http://www.elixirdaze.com) conference talk
Picks Craig Supporting Open Source projects Ruby Together 5 Web Trends for 2017 Progressive Web Apps - mobile first, responsive, offline, cross-platform, Amos Elixir Daze - because I’m speaking The Commodore - Ballast Point brewer Stout All the Indiana Jones movies are on Amazon Prime, but we can ignore the one about aliens Unikernels - Defer Panic
Below are the most impactful words that Craig and Jason selected from each of the 12 principles * Principle #1: Delivery & Customer * Principle #2: Welcome & Change * Principle #3: Frequently & Shorter * Principle #4: Business-People & Together * Principle #5: Trust & Trust * Principle #6: Face-To-Face & Conversation * Principle #7: Measure & Progress * Principle #8: Sustainable & Pace * Principle #9: Continuous & Design * Principle #10: Essential & Work * Principle #11: Emerge & Emerge * Principle #12: Behavior & Adjust Picks Craig Blog – “Talks that changed the way I think about programming” - http://www.opowell.com/post/talks-that-changed-the-way-i-think-about-programming/ Jason Invest to have a great team - In the New Year, spend some time focusing to become a great team – perhaps review the agile manifesto like Craig and I did on this episode and use a discussion of the principles to develop a deeper understanding of your colleagues. Pocket Sized Principles – an activity to compress the agile manifesto down to 3 words per principle - http://tastycupcakes.org/2010/01/pocket-sized-principles/ Live Event – Agile Alliance Technical Conference 2017 (AATC2017) – April 19-21, 2017 – Boston, MA – Jason will be hosting a fusion of open space, coach camp, technical coaching clinic, mob programming and learning games in the Innovation & Collaboration Lab at the second annual Agile Alliance Technical Conference – join us in Boston for fun & learning - https://www.agilealliance.org/agile-alliance-technical-conference-2017/
Amos King interviews Fadik Houry, Francie Van Wirkus and Ryan Ripley following their presentations at Agile Dev East
Amos King interviews John Krewson and David Hussman following their presentations at Agile Dev East
Craig shows how to open yourself up for feedback as he and Amos discuss his recent presentation at Ruby Conf. Craig and Amos demonstrate how to do a retrospective with 2 people, and how to give and receive feedback.
The Return of Waterfall, video from Kent Beck, https://www.youtube.com/watch?v=w4IncnNVzMA Vision Strategy Product Design Engineering
Special Guest: Lee Copeland, Conference Chair at Agile Dev East Discussion Agile Dev East Program Tracks Quality Software DevOps Agile Software Training Leadership Summit Social Networking The Expo
Todd Kaufman, Test Double Discussion Fallacies of Software Developers (Todd Kaufman’s presentation at Agile and Beyond 2016)
Team Cohesion Forming, storming, norming, performing Leading from the back of the room Shared vision Pairing on story writing
Diana Larsen, co-author of “Agile Retrospectives: Making Good Teams Great” visited St. Louis and held an opening gathering at a local agile meetup group. Some of our regular hosts from ThisAgileLife attended this event and took note of the following questions to discuss on a podcast episode to pass along some of the insights Diana shared and also to perhaps add a few of their own.
Released Sunday, January 17, 2016
Hosts: Amos King, Craig Buchek and John Sextro
Discussion Too reactive to requests * 7 Righteous fights
Picks Amos * Glenmorangie – The Quinta Ruban – 12 year single malt scotch finished in a port barrel * New programming jargon from Coding Horror
John * 4 Hands – Absence of Light beer * Bill Gates Reading List
Craig * Not drinking alcohol or soda * The Scrum Guide * Coding Horror Recommended Reading List for Developers * Neil deGrasse Tyson Reading List
Technical Debt Quote “Software is never finished” Phases of a project Race to market MVP MMF Growth
Yay! We made it to 100!!!! The hosts sit down to share their first experiences with agile.
Craig Buchek and Jason Tice both attended the August 2015 St. Louis Agile LINC user group meeting
Jason Tice and Natalie Simonsen Discussion Now that the Agile2015 conference has concluded, join Natalie Simonsen and Jason Tice for a round-robin discussion of their key take-aways and themes from the week
Stephen Vance shares highlights from the multi-team agile framework he has put in place at his organization with Natalie and Renee.
ThisAgileLife celebrated a “winning” episode recorded immediately after guest Dan Parker and Jason Tice won prizes at the Agile2015 “Night at the Museums” vendor raffle event. Jason and Dan were joined by Melanie Hopwood and Charles Elsner (also attending the conference) to discuss sessions they attended on Wednesday, August 5, 2015.
Natalie and Jason were joined by Agile2015 conference attendees including Renee Troughton, Rich Rose Hemlock and Joe Naumann to reflect on the second day of the conference and share a few learnings from the sessions they attended.
Natalie and Jason were joined by Agile2015 conference attendees Rose Hemlock and Joe Naumann to reflect on the first day of the conference and share a few learnings from the sessions they attended
Our annual tradition of providing insights and commentary based upon the 9th annual state of agile survey
Wes Higbee (Full City Tech) author of Commitment To Value: How to make technical projects worthwhile.
We don’t need Scrum Masters and Business Analysts In the future agile teams will optimize around 2 roles, PO and Engineer
Let’s talk about collaboration in a large group, and what happens to a group’s ability to build / maintain a mental model as it becomes larger
Effective standups Purpose all about communication and commitment not about status updates
College/University what they should teach? Code Reviews Do you need to do code reviews when pairing? How much time should you spend on a code review?
Released Sunday, July 6th, 2014
Hosts: John Sextro
Happy July 4th The show will return to its regular schedule on Sunday, July 13, 2014
A self-facilitated retrospective on what we have learned doing the last 50 episodes of ThisAgileLife.
“Getting Value Out of Agile Retrospectives“, by Ben Linders and Luis Gonçalves “With plenty of exercises for your retrospective toolbox, this book will help you to become more proficient in doing retrospectives, and to get more value out of them
The 3 Faces of Environment You were saying that Agile resonated with you because it reminded you of kindergarten?
Pros and Cons of Physical and Digital Work Boards Digital Pros Easily shared and viewed by many Automatic metric capture Cycle Time Cumulative Flow Velocity Trend Analysis Etc.
Happy Holidays from This Agile Life. The next episode will be released on Sunday, January 5, 2014.
Recorded Wednesday, December 18, 2013
Hosts: John Sextro, Amos King, and Craig Buchek
Pair Switching * Pairing, in general * How to pair switch + Using a “Pair-a-mid” to track pairings + How to rotate pairs * Length of pair sessions + 1 week, 2 day, 1 day, half-day, 2 hours, 1 hour, 15 mins + Benefits of short pairing sessions + Pitfalls of long pairing sessions * When to switch + What should trigger a pair switch + Time, using a timer + Story completion * Concerns about context switches * Insights on the C2Wiki
Picks of the Show Craig (@CraigBuchek)
- WireWorld
- Monoprice.com
Amos (@adkron)
- Arduino projects
- Geek Desk, Amos is anticipating the arrival of his new desk
John (@jcsextro)
- Bitcoin
- 7 Habits of Highly Effective Pair Programmers, published article, by Me
- The Hour of Code 2013
Walking Skeleton, Minimal Marketable Feature and Thin Vertical Slice Minimal Marketable Feature, definitive article Walking Skeleton