Editor-in-Chief, ACM Transactions on Computer-Human Interaction (TOCHI)

_TOCHI-fullsizeThe ACM Transactions on Computer-Human Interaction (TOCHI) has long been regarded as the flagship journal of the field. I’ve actually served on their editorial board since 2003, and thus have a long history with the endeavor.

So now that Shumin Zhai’s second term has come to a close, it is a great honor to report that I’ve assumed the helm as Editor-in-Chief. Shumin worked wonders in improving the efficiency and impact of the journal, diligent efforts that I am working hard to build upon. And I have many ideas and creative initiatives in the works that I hope can further advance the journal and help it to have even more impact.

The journal publishes original and significant research papers, and especially likes to see more systems-focused, long-term, or integrative contributions to human-computer interaction. TOCHI also publishes individual studies, methodologies, and techniques if we deem the contributions to be substantial enough. Occasionally impactful, well-argued, and well-supported essays on important  or emerging issues in human-computer interaction are published as well, though not often.

TOCHI prides itself on a rapid turn-around on manuscripts, with an average response time of about 50 days, and we often return manuscripts (particularly when there is not a good fit) much faster than that. We strive to make decisions within 90 days, and although that isn’t always possible, upon acceptance we do also feature very rapid publication. Digital editions of articles publish to the ACM Digital Library as soon as they are accepted, copyedited, and typeset. TOCHI can often, therefore, move articles into publication as fast as or faster than many of the popular conference venues.

Accepted papers at TOCHI also have the opportunity to present at participating SIGCHI conferences, which currently include CHI, CSCW, UIST, and MobileHCI. Authors therefore get the benefits of a rigorous reviewing process with a full journal revision cycle, plus the prestige of the TOCHI brand when you present new work to your colleagues at a top HCI conference.

To keep track of all the latest developments, you can get alerts for new TOCHI articles as they hit the Digital Library — never miss a key new result.  Or subscribe to our feed — just click on the little RSS link on the far right of the TOCHI landing page.


_TOCHI-thumbHinckley, K., Editor-in-Chief, ACM Transactions on CHI. Three-year term, commencing Sept. 1st, 2015. [TOCHI on the ACM Digital Library] 

The flagship journal of CHI.

Paper: Sensing Techniques for Tablet+Stylus Interaction (Best Paper Award)

It’s been a busy year, so I’ve been more than a little remiss in posting my Best Paper Award recipient from last year’s User Interface Software & Technology (UIST) symposium.

UIST is a great venue, particularly renowned for publishing cutting-edge innovations in devices, sensors, and hardware.

And software that makes clever uses thereof.

Title slide - sensing techniques for stylus + tablet interaction

Title slide from my talk on this project. We had a lot of help, fortunately. The picture illustrates a typical scenario in pen & tablet interaction — where the user interacts with touch, but the pen is still at the ready, in this case palmed in the user’s fist.

The paper takes two long-standing research themes for me — pen (plus touch) interaction, and interesting new ways to use sensors — and smashes them together to produce the ultimate Frankenstein child of tablet computing:

Stylus prototype augmented with sensors

Microsoft Research’s sensor pen. It’s covered in groovy orange shrink-wrap, too. What could be better than that? (The shrink wrap proved necessary to protect some delicate connections between our grip sensor and the embedded circuitry).

And if you were to unpack this orange-gauntleted beast, here’s what you’d find:

Sensor components inside the pen

Components of the sensor pen, including inertial sensors, a AAAA battery, a Wacom mini pen, and a flexible capacitive substrate that wraps around the barrel of the pen.

But although the end-goal of the project is to explore the new possibilities afforded by sensor technology, in many ways, this paper kneads a well-worn old worry bead for me.

It’s all about the hand.

With little risk of exaggeration you could say that I’ve spent decades studying nothing but the hand. And how the hand is the window to your mind.

Or shall I say hands. How people coordinate their action. How people manipulate objects. How people hold things. How we engage with the world through the haptic sense, how we learn to articulate astoundingly skilled motions through our fingers without even being consciously aware that we’re doing anything at all.

I’ve constantly been staring at hands for over 20 years.

And yet I’m still constantly surprised.

People exhibit all sorts of manual behaviors, tics, and mannerisms, hiding in plain sight, that seemingly inhabit a strange shadow-world — the realm of the seen but unnoticed — because these behaviors are completely obvious yet somehow they still lurk just beneath conscious perception.

Nobody even notices them until some acute observer takes the trouble to point them out.

For example:

Take a behavior as simple as holding a pen in your hand.

You hold the pen to write, of course, but most people also tuck the pen between their fingers to momentarily stow it for later use. Other people do this in a different way, and instead palm the pen, in more of a power grip reminiscent of how you would grab a suitcase handle. Some people even interleave the two behaviors, based on what they are currently doing and whether or not they expect to use the pen again soon:

Tuck and Palm Grips for temporarily stowing a pen

Illustration of tuck grip (left) vs. palm grip (right) methods of stowing the pen when it is temporarily not in use.

This seems very simple and obvious, at least in retrospect. But such behaviors have gone almost completely unnoticed in the literature, much less actively sensed by the tablets and pens that we use — or even leveraged to produce more natural user interfaces that can adapt to exactly how the user is currently handing and using their devices.

If we look deeper into these writing and tucking behaviors alone, a whole set of grips and postures of the hand emerge:

Core Pen Grips

A simple design space of common pen grips and poses (postures of the hand) in pen and touch computing with tablets.

Looking even more deeply, once we have tablets that support a pen as well as full multi-touch, users naturally want to used their bare fingers on the screen in combination with the pen, so we see another range of manual behaviors that we call extension grips based on placing one (or more) fingers on the screen while holding the pen:

Single Finger Extension Grips for Touch Gestures with Pen-in-hand

Much richness in “extension” grips, where touch is used while the pen is still being held, can also be observed. Here we see various single-finger extension grips for the tuck vs. the palm style of stowing the pen.

People also exhibited more ways of using multiple fingers on the touchscreen that I expected:

Multiple Finger Extension Grips for Touch Gestures with Pen-in-hand

Likewise, people extend multiple fingers while holding the pen to pinch or otherwise interact with the touchscreen.

So, it began to dawn on us that there was all this untapped richness in terms of how people hold, manipulate, write on, and extend fingers when using pen and touch on tablets.

And that sensing this could enable some very interesting new possibilities for the user interfaces for stylus + tablet computing.

This is where our custom hardware came in.

On our pen, for example, we can sense subtle motions — using full 3D inertial sensors including accelerometer, gyroscope, and magnetometer — as well as sense how the user grips the pen — this time using a flexible capacitive substrate wrapped around the entire barrel of the pen.

These capabilities then give rise to sensor signals such as the following:

Grip and motion sensors on the stylus
Sensor signals for the pen’s capacitive grip sensor with the writing grip (left) vs. the tuck grip (middle). Exemplar motion signals are shown on the right.

This makes various pen grips and motions stand out quite distinctly, states that we can identify using some simple gesture recognition techniques.

Armed with these capabilities, we explored presenting a number of context-appropriate tools.

As the very simplest example, we can detect when you’re holding the pen in a grip (and posture) that indicates that you’re about to write. Why does this matter? Well, if the touchscreen responds when you plant your meaty palm on it, it causes no end of mischief in a touch-driven user interface. You’ll hit things by accident. Fire off gestures by mistake. Leave little “ink turds” (as we affectionately call them) on the screen if the application responds to touch by leaving an ink trace. But once we can sense it’s your palm, we can go a long ways towards solving these problems with pen-and-touch interaction.

To pull the next little rabbit out of my hat, if you tap the screen with the pen in hand, the pen tools (what else?) pop up:

Pen tools appear

Tools specific to the pen appear when the user taps on the screen with the pen stowed in hand.

But we can take this even further, such as to distinguish bare-handed touches — to support the standard panning and zooming behaviors —  versus a pinch articulated with the pen-in-hand, which in this example brings up a magnifying glass particularly suited to detail work using the pen:

Pen Grip + Motion example: Full canvas zoom vs. Magnifier tool

A pinch multi-touch gesture with the left hand pans and zooms. But a pinch articulated with the pen-in-hand brings up a magnifier tool for doing fine editing work.

Another really fun way to use the sensors — since we can sense the 3D orientation of the pen even when it is away from the screen — is to turn it into a digital airbrush:

Airbrush tool using the sensors

Airbrushing with a pen. Note that the conic section of the resulting “spray” depends on the 3D orientation of the pen — just as it would with a real airbrush.

At any rate, it was a really fun project that garnered a best paper award,  and a fair bit of press coverage (Gizmodo, Engadget, & named FastCo Design’s #2 User Interface innovation of 2014, among other coverage). It’s pretty hard to top that.

Unless maybe we do a lot more with all kinds of cool sensors on the tablet as well.


You might just want to stay tuned here. There’s all kinds of great stuff in the works, as always (grin).

Sensing Pen & Tablet Grip+Motion thumbnailHinckley, K., Pahud, M., Benko, H., Irani, P., Guimbretiere, F., Gavriliu, M., Chen, X., Matulic, F., Buxton, B., Wilson, A., Sensing Techniques for Tablet+Stylus Interaction.  In the 27th ACM Symposium on User Interface Software and Technology (UIST’14)  Honolulu, Hawaii, Oct 5-8, 2014, pp. 605-614. http://dx.doi.org/10.1145/2642918.2647379

Watch Context Sensing Techniques for Tablet+Stylus Interaction video on YouTube

Commentary: On Excellence in Reviews, Thoughts for the HCI Community

Peer review — and particularly the oft-sorry state it seems to sink to — is a frequent topic of conversation at the water-coolers and espresso machines of scientific institutions the world over.

Of course, every researcher freshly wounded by a rejection has strong opinions about reviews and reviewers.  These are often of the sort that are spectacularly unfit to print, but they are widely held nonetheless.

Yet these same wounded researchers typically serve as reviewers themselves, and write reviews which other authors receive.

And I can assure you that “other authors” all too frequently regard the remarks contained in the reviews of these erstwhile wounded researchers with the same low esteem.

So if we play out this vicious cycle to its logical conclusion, in a dystopian view peer review boils down to the following:

  • We trash one another’s work.
  • Everything gets rejected.
  • And we all decide to pack up our toys and go home.

That’s not much of a recipe for scientific progress.

But what fuels this vicious cycle and what can be done about it?

As reviewers, how can we produce Excellent Reviews that begin to unwind this dispiriting scientific discourse?

As authors, how should we interpret the comments of referees, or (ideally) write papers that will be better received in the first place?

When I pulled together the program committee for the annual MobileHCI conference last year, I found myself pondering all of these issues, and really wondering what we could do to advance the conference’s review process with a positive footing.

And particularly because MobileHCI is a smaller venue, with many of the program committee members still relatively early in their research careers, I really wanted to get them started with the advice that I wished someone had given me when I first started writing and reviewing scientific papers in graduate school.

So I penned an essay that surfaces all of these issues. It describes some of the factors that lead to this vicious cycle in reviews. It makes some very specific recommendations about what an excellent review is, and how to produce one. And if you read it as an author (perhaps smarting from a recent rejection) who wants to better understand where the heck do these reviews come from anyway? and as a by-product actually write better papers, then reading between the lines will give you some ideas of how to go about that as well.

And I was pleased, if not more than a bit surprised, to see that my little rant essay was well-received by the research community:

And I received many other private responses with a similar tenor.

So if you care at all about these issues I hope that you will take a look at what I had to say. And circle back here to leave comments or questions, if you like.

There’s also a companion presentation [Talk PPTX] [Talk PDF], which I used with the MobileHCI program committee to instill a positive and open-minded attitude as we embarked on our deliberations. I’ve included that here as well in the hope that it might be of some use to others hoping to gain a little insight into what goes on in such meetings, and how to run them.

Thumbnail - Excellence in ReviewsHinckley, K., So You’re a Program Committee Member Now: On Excellence in Reviews and Meta-Reviews and Championing Submitted Work That Has Merit. Published as “The MobileHCI Philosophy” on the MobileHCI 2015 Web Site, Feb 10th, 2015. [Official MobileHCI Repository PDF] [Author’s Mirror Site PDF], [Talk PPTX] [Talk PDF].

Award: CHI Academy, 2014 Inductee

I’ve been a bit remiss in posting this, but as of April 2014, I’m a member of the CHI Academy, which is an honorary group that recognizes leaders in the field of Human-Computer interaction.

Among whom I can apparently I now include myself, strange as that  may seem.

I was completely surprised by this and can honestly say I never expected any special recognition. I’ve just been plugging away on my little devices and techniques, writing papers here and there, but I suppose over the decades it all adds up. I don’t know if this means that my work is especially good or that I’m just getting older, but either way I appreciate the gesture of recognition from my peers in the field.

I was in a bit of a ribald mood when I got the news, so when the award organizers asked me to reply with my bio I decided what the heck and decided to have some fun with it:

Ken Hinckley is a Principal Researcher at Microsoft Research, where he has spent the last 17 years investigating novel input devices, device form-factors, and modalities of interaction.

He feels fortunate to have had the opportunity to collaborate with many CHI Academy members while working there, including noted trouble-makers such as Bill Buxton, Patrick Baudisch, and Eric Horvitz—as well as George Robertson, whom he owes a debt of gratitude for hiring him fresh out of grad school.

Ken is perhaps best know for his work on sensing techniques, cross-device interaction, and pen computing. He has published over 75 academic papers and is a named inventor on upwards of 150 patents. Ken holds a Ph.D. in Computer Science from the University of Virginia, where he studied with Randy Pausch.

He has also published fiction in professional markets including Nature and Fiction River, and prides himself on still being able to hit 30-foot jump shots at age 44.

Not too shabby.

Now, in the spirit of full disclosure, there are no real perks associated with being a CHI Academy member as far as I’ve been able to figure. People do seem to ask me for reference letters just a tiny bit more frequently. And I definitely get more junk email from organizers of dubious-sounding conferences than before. No need for research heroics if you want a piece of that, just email me and I’d be happy to forward them along.

But the absolute most fun part of the whole deal was a small private celebration that noted futurist Bill Buxton organized at his ultra-modern home fronting Lake Ontario in Toronto, and where I was joined by my Microsoft Research colleagues Abigail Sellen, her husband Richard Harper, and John Tang. Abi is already a member (and an occasional collaborator whom I consider a friend), and Richard and John were inducted along with me into the Academy in 2014.

Bill Buxton needs no introduction among the avant garde of computing. And he’s well known in the design community as well, not to mention publishing on equestrianism and mountaineering, among other topics. In particular, his collection of interactive devices is arguably the most complete ever assembled. Only a tiny fraction of it is currently documented on-line. It contains everything from the world’s first radio and television remote controls, to the strangest keyboards ever conceived by mankind, and even the very first handcrafted wooden computer mice that started cropping up in the 1960’s.

The taxi dropped me off, I rang the doorbell, and when a tall man with rock-star hair gone gray and thinned precipitously by the ravages of time answered the door, I inquired:

“Is this, by any chance, the Buxton Home for Wayward Input Devices?”

To which Bill replied in the affirmative.

I indeed had the right place, I would fit right in here, and he showed me in.

Much of Bill’s collection lives off the premises, but his below-ground sanctum sanctorum was still walled by shelves bursting with transparent tubs packed with handheld gadgets that had arrived far before their time, historical mice and trackballs, and hybrid bastard devices of every conceivable description. And what little space remained was packed with books on design, sketching, and the history of mountaineering and the fur trade.

Despite his home office being situated below grade, natural light poured down into it through the huge front windows facing the inland sea, owing to the home’s modern design. Totally awesome space and would have looked right at home on the front page of Architectural Digest.

Bill showed us his origami kayak on the back deck, treated us all to some hand-crafted martinis in the open-plan kitchen, and arranged for transportation to the awards dinner via a 10-person white stretch limousine. We even made a brief pit stop so Bill could dash out and pick up a bottle of champagne at a package store.

Great fun.

I’ve known Bill since 1994, when he visited Randy Pausch’s lab at the University of Virginia, and ever since people have often assumed that he was my advisor. He never was in any official capacity, but I read all of his papers in that period and in many ways I looked up to him as my research hero. And now that we’ve worked together as colleagues for nearly 10 years (!), and with Randy’s passing, I often do still see him as a mentor.

Or is that de-mentor?

Probably a little bit of each, in all honesty (grin).

Yeah, the award was pretty cool and all, but it was the red carpet thrown out by Bill that I’ll always remember.

Thumbnail - Ken Hinckley CHI Academy 2014 InducteeHinckley, K., CHI Academy. Inducted April 27th, 2014 at CHI 2014 in Toronto, Ontario, Canada, for career research accomplishments and service to the ACM SIGCHI community (Association of Computing Machinery’s Special Interest Group on Computer-Human Interaction). [Ken Hinckley CHI Academy Bio] 

The CHI Academy is an honorary group of individuals who have made substantial contributions to the field of human-computer interaction. These are the principal leaders of the field, whose efforts have shaped the disciplines and/or industry, and led the research and/or innovation in human-computer interaction. The criteria for election to the CHI Academy are:

  • Cumulative contributions to the field.
  • Impact on the field through development of new research directions and/or innovations.
  • Influence on the work of others.
  • Reasonably active participant in the ACM SIGCHI community.

Book Chapter: Input/Output Devices and Interaction Techniques, Third Edition

Thumbnail for Computing Handbook (3rd Edition)Hinckley, K., Jacob, R., Ware, C. Wobbrock, J., and Wigdor, D., Input/Output Devices and Interaction Techniques. Appears as Chapter 21 in The Computing Handbook, Third Edition: Two-Volume Set, ed. by Tucker, A., Gonzalez, T., Topi, H., and Diaz-Herrera, J. Published by Chapman and Hall/CRC (Taylor & Francis), May 13, 2014.  [PDF – Author’s Draft – may contain discrepancies]

Invited Talk: WIPTTE 2015 Presentation of Sensing Techniques for Tablets, Pen, and Touch

The organizers of WIPTTE 2015, the Workshop on the Impact of Pen and Touch Technology on Education, kindly invited me to speak about my recent work on sensing techniques for stylus + tablet interaction.

One of the key points that I emphasized:

To design technology to fully take advantage of human skills, it is critical to observe what people do with their hands when they are engaged in manual activites such as handwriting.

Notice my deliberate the use of the plural, hands, as in both of ’em, in a division of labor that is a perfect example of cooperative bimanual action.

The power of crayon and touch.

My six-year-old daughter demonstrates the power of crayon and touch technology.

And of course I had my usual array of stupid sensor tricks to illustrate the many ways that sensing systems of the future embedded in tablets and pens could take advantage of such observations. Some of these possible uses for sensors probably seem fanciful, in this antiquated era of circa 2015.

But in eerily similar fashion, some of the earliest work that I did on sensors embedded in handheld devices also felt completely out-of-step with the times when I published it back in the year 2000. A time so backwards it already belongs to the last millennium for goodness sakes!

Now aspects of that work are embedded in practically every mobile device on the planet.

It was a fun talk, with an engaged audience of educators who are eager to see pen and tablet technology advance to better serve the educational needs of students all over the world. I have three kids of school age now so this stuff matters to me. And I love speaking to this audience because they always get so excited to see the pen and touch interaction concepts I have explored over the years, as well as the new technologies emerging from the dim fog that surrounds the leading frontiers of research.

Harold and the Purple Crayon book coverI am a strong believer in the dictum that the best way to predict the future is to invent it.

And the pen may be the single greatest tool ever invented to harness the immense creative power of the human mind, and thereby to scrawl out–perhaps even in the just-in-time fashion of the famous book Harold and the Purple Crayon–the uncertain path that leads us forward.

                    * * *

Update: I have also made the original technical paper and demonstration video available now.

If you are an educator seeing impacts of pen, tablet, and touch technology in the classroom, then I strongly encourage you to start organizing and writing up your observations for next year’s workshop. The 2016 edition of the series, (now renamed CPTTE) will be held at Brown University in Providence, Rhode Island, and chaired by none other than the esteemed Andries Van Dam, who is my academic grandfather (i.e. my Ph.D. advisor’s mentor) and of course widely respected in computing circles throughout the world.

Thumbnail - WIPTTE 2015 invited TalkHinckley, K., WIPTTE 2015 Invited Talk: Sensing Techniques for Tablet + Stylus Interaction. Workshop on the Impact of Pen and Touch Technology on Education, Redmond, WA, April 28th, 2015. [Slides (.pptx)] [Slides PDF]


Project: Bimanual In-Place Commands

Here’s another interesting loose end, this one from 2012, which describes a user interface known as “In-Place Commands” that Michel Pahud, myself, and Bill Buxton developed for a range of direct-touch form factors, including everything from tablets and tabletops all the way up to electronic whiteboards a la the modern Microsoft Surface Hub devices of 2015.

Microsoft is currently running a Request for Proposals for Surface Hub research, by the way, so check it out if that sort of thing is at all up your alley. If your proposal is selected you’ll get a spiffy new Surface Hub and $25,000 to go along with it.

We’ve never written up a formal paper on our In-Place Commands work, in part because there is still much to do and we intend to pursue it further when the time is right. But in the meantime the following post and video documenting the work may be of interest to aficionados of efficient interaction on such devices. This also relates closely to the Finger Shadow and Accordion Menu explored in our Pen +Touch work, documented here and here, which collectively form a class of such techniques.

While we wouldn’t claim that any one of these represent the ultimate approach to command and control for direct input, in sum they illustrate many of the underlying issues, the rich set of capabilities we strive to support, and possible directions for future embellishments as well.

Thumbnail for In-Place CommandsKnies, R. In-Place: Interacting with Large Displays. Reporting on research by Pahud, M., Hinckley, K., and Buxton, B. TechNet Inside Microsoft Research Blog Post, Oct 4th, 2012. [Author’s cached copy of post as PDF] [Video MP4] [Watch on YouTube]

In-Place Commands Screen Shot

The user can call up commands in-place, directly where he is working, by touching both fingers down and fanning out the available tool palettes. Many of the functions thus revealed act as click-through tools, where the user may simultaneously select and apply the selected tool — as the user is about to do for the line-drawing tool in the image above.

Watch Bimanual In-Place Commands video on YouTube