[Xmca-l] Re: The Emergence of Boundary Objects

Rolf Steier rolfsteier@gmail.com
Wed Jul 15 12:26:04 PDT 2015


Wow - many interesting threads emerging here!

One issue seems to be this tension between the designer's or architect's
role in informing the experience of the user, and the level of
intentionality they are able to impart. Are the decisions of the designers
introducing affordances to a setting? constraints? meaning potentials?

A second theme is about the social practices of orientation, "inclusion,"
and perhaps the ongoing nature of these shared performances (including the
"ma" - Larry, I will have to explore this concept more as I find it lovely).

In relation to this first issue, I suspect that my perspective may differ
from many of you here, but we shall see. Lubomir - you suggest that *"**What
they embed as a meaningful physical component or a sign can be and is
interpreted very differently by the building users."* Michael's experience
with Jackson Pollack at MOMA seems consistent with this view, and I think
that I largely agree. That is, that designers cannot impose particular
experiences on users - that unintended affordances emerge and are
inevitable. However, I don't think that this is inconsistent with the
possibility that a designer can influence the possible experiences of users
in meaningful ways. In an earlier email - I mentioned the architect's role
the placemaking experience of the user as connecting to the introducing of
placemaking potentials, or meaning potentials (I'm using this concept very
generally - based loosely on Rommetveit and Bakhtin). I view these as
possible meanings or possible experiences that the architects intend
to facilitate, but not necessarily impose. Part of this has to do with the
level at which we view the intentionality of the designer. Michael - in
your experience at MOMA, I agree that an architect/curator team could not
possibly plan for the significance of your experience at that time in your
life. At the same time, we could perhaps imagine these designers intending
to build a place that supports personal reflection at a more general level
(by controlling the sound, lighting, physical configurations of the
artifacts, etc). The actual "placemaking" is still not realized until the
users actually inhabit this space, but I view the designers as a
fundamental part of this development.

I view the role of designers as more imaginative than predictive. They are
imagining possible experiences, and then building the spaces that hopefully
(but not necessarily) support those experiences.

I also want to return to the second theme mentioned above, but I need a
little more time to think it through. I'm really enjoying this discussion
so far,
Rolf



On Wed, Jul 15, 2015 at 8:32 PM, Glassman, Michael <glassman.13@osu.edu>
wrote:

> Hi Alfredo,
>
> I have been reading Bateson through a cybernetics lens lately (Bateson
> along with Lewin and his wife Margaret Mead were part of the original Sears
> conferences)  and I'm not sure that's right or I am victim to the "when you
> have a hammer, everything looks like a nail" but....
>
> I think Bateson was arguing with those looking to apply the more
> physical/mathematical origins of cybernetics to human or really (pace the
> pig story) and system that moves beyond simple physical feedback loops.  I
> think his larger point is that everything has a response within the larger
> feedback system that exists but we cannot go - what Bateson refers to as
> MIND.  Attempts to create and control feedback loops, to try and design a
> system for specific types of feedback is a dangerous proposition.
>
> This I think is the reason that affordances really can't be designed into
> an ecology, only a recognition of the context in which actions are taking
> place (and I say this having no idea what Gibson's relationship to
> cybernetics was).  Taking Larry's example of the girl it is perhaps also
> likely that the girl could have taken the fixing of hair as a criticism, an
> attack, and it might have destroyed her confidence.  Both make sense in
> terms of feedback loops, but only ad hoc.  So if a designer does in some
> way design that experience into the action, even without meaning they are
> taking a large chance, because they do not know the trajectory it will
> take.  We simply need objects that are part of our journey, part of the
> larger context but not designed for purpose, for feedback.  There is no
> assumption about trajectory.
>
> I think Don Norman sort of muddied the waters on this, but in an
> interesting way.  That we can assume people are going to want to do certain
> things in a very general environment - when  you enter a dark room you want
> light, so it is possible to design objects that meet that need that we are
> more likely to find in the moment that we need them.  But I think that is
> very different from the idea of specifically guiding feedback loops that
> even take generalized experience in a certain direction.  I am thinking
> about Dewey, and he makes a similar argument to Bateson with his concept of
> transactions.  Although he does seem to think that it is possible to create
> a larger field of action so we can see at least local interrelationships.
> But his idea of experience is also very much one of discovery based on
> needs at the immediate moment - social relations act as a vehicle for these
> discoveriesn(Dewey of course was writing before Gibson and for most of his
> life before cybernetics.  I also wonder what he thought of cybernetics).
>
> I think I disagree with you, constraints are not about the journey but
> about the road.  If you build a road on the side of the river you are
> constrained because no matter what, you cannot turn right.  Your direction
> has already been partially determined by the designer of the road.  But the
> mistake we make is in thinking that also controls the trajectory of the
> individual's journey.  The effect of designers on trajectories of action is
> important, but limited.
>
> The primary place that designers have influence on affordances it seems to
> me is by being able to create a unique context for an individual's and a
> group's that limit possible trajectories on an individual's journey.  But
> we should never mistake those constraints for affordances.  I think Bateson
> might argue it is hubris to do so.  Perhaps this is what you are saying
> Alfredo.
>
> Michael
>
>
>
> -----Original Message-----
> From: xmca-l-bounces+mglassman=ehe.ohio-state.edu@mailman.ucsd.edu
> [mailto:xmca-l-bounces+mglassman=ehe.ohio-state.edu@mailman.ucsd.edu] On
> Behalf Of Alfredo Jornet Gil
> Sent: Wednesday, July 15, 2015 12:38 PM
> To: Rolf Steier; eXtended Mind, Culture, Activity
> Subject: [Xmca-l] Re: The Emergence of Boundary Objects
>
> I'd like to follow up on Michael's post by asking a question: Are not
> affordances presupposed by constraints and are not constraints presupposed
> by affordances? If so, I would wonder whether it makes sense to ask whether
> museums should be designed for affordances and constraints.
>
> What I think is clear from the anecdote that you bring about the Jackson
> Pollock corner is that whatever EXPERIENCE emerges from being somewhere
> (i.e. being someone at some time in some place) cannot be INTENDED. And I
> think this applies both to designers and users, to those who set things up
> for you to experience and to you, who could not foresee what your
> experience was going to turn you into before you go through it.
>
> I think that the big issue that you bring on the table (to continue with
> Larry's metaphor) has to do with a difference between physical relations
> and social relations, and the idea of MEDIATION. Gregory Bateson noticed
> that the relations that are the subject matter in physics are not the same
> as those that are the subject matter in communication. He noticed that
> physical relations (relations that are the object of study of physics)
> transfer energy in direct manners: a billiard ball hits another ball and we
> can anticipate the exact speed and direction that the second ball will take
> based on the energy that is in the system ball + ball + someone hitting. In
> living beings, the things are different. Bateson explained, if we kick a
> pig's ass (I think he used this somehow bizarre example) the reaction of
> the pig is not accounted for by the energy that is contained in the kick,
> at least not in a direct manner. The energy that moves the pig is from a
> different source. Before Bateson, it was Vygotsky and his notion of
> mediation who would most clearly state that social relations are not
> direct, but mediated.
>
> So, how can design go about this? If we, along with Dewey and Vygotsky,
> consider experience to be a unity of person and environment, and we assume
> as well that this is a social (not just individual) category, and that how
> a situation is experienced is also refracted through the social relations
> within which we engage, the most designers can do is to foster social
> relations go on, giving afordances to prcesses of signification, without
> intending to embed meanings. It is about affordances/constraints, but not
> about how to interpret something, but about going about interpreting. I
> think.
>
> Best wishes,
> Alfredo
> ________________________________________
> From: xmca-l-bounces+a.g.jornet=iped.uio.no@mailman.ucsd.edu
> <xmca-l-bounces+a.g.jornet=iped.uio.no@mailman.ucsd.edu> on behalf of
> Glassman, Michael <glassman.13@osu.edu>
> Sent: 15 July 2015 18:04
> To: Rolf Steier; eXtended Mind, Culture,        Activity
> Subject: [Xmca-l] Re: The Emergence of Boundary Objects
>
> So after reading the article and the e-mail discussion I'm beginning to
> think there is a really big issue here that I am trying to grapple with,
> especially in terms of boundary objects (which I admittedly do not
> understand very well).  And it relates to the metaphor of the table (both
> as discussed by Larry and Ingold as interpreted by Rolf).  It is this, in
> the museum should the place be set up as affordances, perceived
> affordances, or constraints?  It seems the museum in the study has
> potential affordances for the users.  The cultural historical moment
> (unable to think of any other word) of the museum sets the context, meaning
> those walking through the museum are going to be restricted by the
> historical and cultural boundaries leading up to the art work, along with
> the expectations and needs of the individuals moving through the museum,
> but they will come across objects/artifacts that they think meets the needs
> of their particular journeys. The posing becomes both an internalization
> and externalization of the thinking (or are they one continuum at this
> point?) in which they both make sense of the object in terms of their own
> meaning and needs and also try and communicate what they found, leaving a
> potential trails for others.
>
> An example that has stayed with me for years.  Living in New York I used
> to go to the Museum of Modern Art on a semi-regular basis (in large part to
> try and meet women, always unsuccessful).  I would often visit the Jackson
> Pollock corner.  I would look and it would always be meaningful to me and I
> would move one quickly.  Once, soon after graduating college and unemployed
> and about as frustrated as I'd ever been I viewed the same paintings.  At
> that moment Pollock made sense to me, a deep emotional punch - the
> paintings became objects that could bridge my rage, sadness and fear to the
> next moment in my life.  There is no way a designer could have planned this
> affordance.  It was based on the movement not just through the museum but
> my life.  I think back to what my gestures, or even posing might have been
> at that moment.  A slumping in to myself, an internalization perhaps of a
> socially sanctioned symbol of rage.  But perhaps a posture also that said
> stay away.  The place I created in that moment was one that included me and
> whatever demons Jackson Pollock fought with.
>
> Or should museums should be designed for what Don Norman refers to as
> perceived affordances?  The table that is set up can be one of perceived
> affordances.  What I grab for the spoon because its shape makes sense in my
> need/desire to eat cereal.  The focus goes from cultural history setting a
> general context - Jackson Pollock is a sanctioned way to bridge emotions,
> to actually setting the trajectory of the act.  I sit at a table, I want to
> eat cereal, I must follow sanctioned rule systems, I know what I need at
> that moment and look for objects that fit my needs.  Is the room in the
> article about perceived affordances.  Should the museum be designed for
> perceived affordances.  A person coming upon an object may be thinking this
> because of what it means in our society to be walking through a museum.
> The object offers an opportunity to make communicative gestures, such as
> recreating the posture of The Thinker the authors refer to.  I have seen
> many shows, movies where this happens, from movies from the 1940s to the
> Rugrats.  This is the cultural cue of what we do with art objects in a
> museum, we gesture to both understand and communicate.
>
> Or should museums be designed as constraints.  In the Metropolitan Museum
> of Art (sorry for the New York centric places but that's where I spent most
> of my museum life) the rooms are set up very, very carefully, so that in
> many ways the objects (at least are meant to I think) to constrain your
> thinking, so that you are responding to a certain period or school of art,
> understanding how it all fits together.  The table metaphor fits here as
> well I think.  Does the table constrain our actions, limiting to certain
> types of behavior (use only certain types of forks for certain types of
> food).
>
> Okay, too much I know.
>
> Michael
>
>
>
> -----Original Message-----
> From: xmca-l-bounces+mglassman=ehe.ohio-state.edu@mailman.ucsd.edu
> [mailto:xmca-l-bounces+mglassman=ehe.ohio-state.edu@mailman.ucsd.edu] On
> Behalf Of Rolf Steier
> Sent: Wednesday, July 15, 2015 6:58 AM
> To: Alfredo Jornet Gil
> Cc: eXtended Mind, Culture, Activity; mike cole; lchc-l@mailman.ucsd.edu
> Subject: [Xmca-l] Re: The Emergence of Boundary Objects
>
> Thank you for your thoughts Larry,
>
> I wanted to pick up on your suggestion of the table metaphor because I
> think that's really interesting. I believe you are proposing the shared
> meal as analogous to the kind of orientation work (or perhaps Leigh Star
> might consider this translation or pre-translation work?) that precedes the
> task at hand (in the case of our study, the task is design). Excerpt 3 from
> our study might be relevant here, when in turn 6, the curator turns to the
> researcher, leans in, and points in order to create a shared visual field.
> The curator and the researcher can now orient towards the existing gallery
> in order to imagine future, possible changes in the gallery. The curator is
> in a sense extending an invitation to sit down at the same table to be able
> to share his vision for the gallery.
>
> This shared meal might of course also be considered designed. Ingold (
> *Making*) actually uses this same table metaphor to demonstrate the
> facilitation of activity as an aspect of design - *"Everyday design catches
> the narrative and pins it down, establishing a kind of choreography for the
> ensuing permanence that allows it to proceed from the moment you sit down
> to eat. In such a straightforward task as laying the table - in enrolling
> into your relation bowl and spoon, milk jug and cereal box - you are
> designing breakfast."*
>
> There is an improvisational quality to the bodily/performative orientation
> work that is maybe not captured by the shared expectations of sitting down
> to a meal. But at the same time, we can also consider the workspace of the
> multidisciplinary design team as designed in the same way that the meal is
> designed in order to support the objective of the meeting. That is, the,
> design team must first engage in a place-making activity for their
> collaborative setting in order to attend to the design of the exhibition
> space. The designers set the table with a white board, sketches and design
> ideas, perhaps some coffee... etc., before turning to the task of imagining
> the future exhibition.
>
> Lubomir, you asked - *"who are the placemakers -- the architects or the
> USERS of designed/created/socially produced spaces?" *I think this is
> difficult to answer because both architect and user play a role in the
> place-making process. The architects embed possible meanings (if place and
> meaning are analogous than perhaps these might be considered 'place
> potentials') that only emerge through the activity of the users. I'm only
> thinking through this now, so feel free to elaborate or to disagree!
>
> Rolf
>
> On Tue, Jul 14, 2015 at 11:28 PM, Alfredo Jornet Gil <a.j.gil@iped.uio.no>
> wrote:
>
> > Thanks a lot, Lubomir!
> >
> > On to your question, I am tempted to stretch a bit across frameworks
> > and answer that, the difference between the process of performing an
> > activity in space and developing a sense of place would be akin to the
> > difference between an operation and an action as per Activity theory.
> >
> > Again, we must be careful on the distinction between space as a sort
> > of objective geometrical coordinate, or space as not becoming a part of
> "an"
> > experience (in Dewey's sense). In the first sense, the sentence
> > "performing an activity in space" makes only sense when talking about
> > geometrical practices, for example; one may think that in some
> > engineering practices, it is possible to orient to space as space, as
> > a coordinate. BUT still, the experience of being doing such practice,
> > if it has import to further development in the person, it must be
> > refracted through the person's experience; there must be involvement,
> > and therefore placemaking. In the second case, we might think of us
> > performing some activity within taking much of it, without noticing we
> > are doing. It is in this sense that I do the bridge with operations
> versus actions.
> >
> > I would not have many problems in associating place with meaning and
> > placemaking with meaning-making, although I personally would be
> > careful if doing so, emphasizing the situational and distributed
> > nature of the process that placemaking attempts to capture.
> >
> > Hope this helps
> > Alfredo
> > ________________________________________
> > From: Lubomir Savov Popov <lspopov@bgsu.edu>
> > Sent: 14 July 2015 23:06
> > To: Alfredo Jornet Gil; Rolf Steier; eXtended Mind, Culture,    Activity
> > Cc: mike cole; lchc-l@mailman.ucsd.edu
> > Subject: RE: [Xmca-l] Re: The Emergence of Boundary Objects
> >
> > Thank you Alfredo,
> >
> > By the way, I should have started my mail with an appreciation for
> > your article and Mike's choice to bring it to our attention.
> >
> > Now it is almost clear how you use the word and conceptualize the
> > phenomenon. I would respectfully ask you for a few more things: what
> > is the difference between the process of performing an activity in
> > space and developing a sense of place. I personally interpret place in
> > terms of appropriation of space in the process of human activity and
> > the subsequent meaning making which has existential importance for the
> > individual. The phenomenon of place is on par with the phenomenon of
> > meaning and placemaking is a process on par with meaning making. How
> > do you position yourself regarding such conceptualization?
> >
> > On a similar note, who are the placemakers -- the architects or the
> > USERS of designed/created/socially produced spaces?
> >
> > By the way, I might be stretching too much the part on place and
> > distracting from other aspects of your wonderful article.
> >
> > Best wishes,
> >
> > Lubomir
> >
> > -----Original Message-----
> > From: Alfredo Jornet Gil [mailto:a.j.gil@iped.uio.no]
> > Sent: Tuesday, July 14, 2015 4:31 PM
> > To: Lubomir Savov Popov; Rolf Steier; eXtended Mind, Culture, Activity
> > Cc: mike cole; lchc-l@mailman.ucsd.edu
> > Subject: Re: [Xmca-l] Re: The Emergence of Boundary Objects
> >
> > Dear Lubomir,
> >
> > thanks for your questions. I agree that the notion of place has been
> > around in different forms during at least the last 20 years or so,
> > from geography with Tuan, technology with Dourish, to the so-called
> > place-based education. I must also admit that we did not work with a
> > carefully operationalized definition when using the term in the paper,
> > but I can of course share my view on the issue and how I understand it.
> >
> > For me, as in most of the cases mentioned above, place is a way of
> > emphasizing the experiential in what comes to be socially or humanly
> > relevant. Most simply, and this most of you probably know, is about
> > the difference between a rationalistic, geometrical conception of
> > space versus a more phenomenological one. I read Streek (2010) citing
> > Cresswell about
> > place: "Place is about stopping and resting and becoming involved".
> > This is precisely what we aimed to emphasize in our paper, that
> > whatever practices were involved in getting things done together in an
> > interdisciplinary group, they involved a process of becoming involved,
> > experientially, emotionally, bodily, with the materials and currents
> > going on in a given situation.
> >
> > I also read Ingold (2011) warning against the difference between space
> > and place in terms of space being a reality substance and place being
> > constituted by subsequent level of abstractions. In my view,
> > experience is not about abstraction, but about involvement. And place
> > is about space as it is refracted in intelligible experience; not
> > about an abstraction over an objective field, but more related to a
> perezhivanie in Vygotsky's sense.
> >
> > Alfredo
> > ________________________________________
> > From: Lubomir Savov Popov <lspopov@bgsu.edu>
> > Sent: 14 July 2015 21:55
> > To: Rolf Steier; eXtended Mind, Culture,        Activity; Alfredo Jornet
> > Gil
> > Cc: mike cole; lchc-l@mailman.ucsd.edu
> > Subject: RE: [Xmca-l] Re: The Emergence of Boundary Objects
> >
> > Dear Rolf and Alfredo,
> >
> > What is your definition for place? How is place different from space?
> > I ask because people use the words place and peacemaking in dozens of
> > different ways; it is just mindboggling.
> >
> > Thanks,
> >
> > Lubomir
> >
> > -----Original Message-----
> > From: xmca-l-bounces+lspopov=bgsu.edu@mailman.ucsd.edu [mailto:
> > xmca-l-bounces+lspopov=bgsu.edu@mailman.ucsd.edu] On Behalf Of Rolf
> > xmca-l-bounces+Steier
> > Sent: Tuesday, July 14, 2015 2:44 PM
> > To: Alfredo Jornet Gil
> > Cc: eXtended Mind, Culture, Activity; mike cole;
> > lchc-l@mailman.ucsd.edu
> > Subject: [Xmca-l] Re: The Emergence of Boundary Objects
> >
> > Hello All,
> >
> > I also want to thank everyone for participating in this discussion,
> > and I'm looking forward to developing some of the ideas from our text.
> > I think that Alfredo did a nice job of introducing the context of our
> > study, so I don't have much to add. The two aspects that Mike brings
> > up are also very much of interest to me, and I think quite closely
> > related. I think we treat 'distributed imagination' in this instance
> > as a form of place-making for a space that doesn't exist yet (the
> > museum exhibition). At the same time, the place where this design work
> > is occurring is also undergoing a transformation from space to place
> > as the participants construct representations and begin to
> > collaborate. Alfredo and I were playing with an illustration of these
> > trajectories as merging, though we weren't able to bring it together -
> > so maybe this discussion can allow us to flesh out these thoughts.
> >
> > I'm looking forward to the discussion!
> > Rolf
> >
> > On Tue, Jul 14, 2015 at 7:38 PM, Alfredo Jornet Gil
> > <a.j.gil@iped.uio.no>
> > wrote:
> >
> > >  Hi Mike and all,
> > >
> > >
> > >  thanks for recommending our article for discussion, and thanks to
> > > anyone who wishes to participate. We really appreciate it! I can try
> > > to say a bit about the article.
> > >
> > > Rolf and I did our PhD as part of two different projects that had a
> > > science museum and an art museum as settings for the design of
> > > technology-enhanced learning environments. Early on in the PhD, we
> > > begun talking about notions of space as central in our respective
> > > projects. During the last year, we shared office and had much more
> > > time to discuss. We had always wanted to write something together
> > > and the MCA special issue on Leigh Star seemed the perfect occasion.
> > >
> > > The design meetings involved many participants from different
> > > backgrounds, from education to architecture and software
> > > engineering, and sometimes it was difficult for the teams to advance
> > > towards definite solutions. I remember watching the videos from the
> > > first months of design work, hoping to find something for writing a
> > > first paper. I found different interesting issues to pursue, but one
> > > episode clearly stood out from the rest. It was a design meeting,
> > > after many meetings with lots of disagreements and dead ends, in
> > > which a discussion that concerned a wall in the museum space
> > > unexpectedly appeared to trigger lots of good ideas in the design
> > > team. It stroke me that something as banal and simple as a wall had
> > > been important in making it possible for the participants to achieve
> > > shared perspectives on the task and go on. I remembered then to have
> > > read something about boundary objects, and it was then that the
> > > figure of Leigh Star begun to
> > be relevant.
> > >
> > > In this paper, the aim was to consider boundary "objects"  from the
> > > perspective of the participants' "bodies," which stood out in our
> > > analyses as particularly relevant for the achievement of
> > > co-operation despite lack of substantive agreement. Rather than
> > > shared substantive understandings, what seemed to allow the
> > > participants to proceed was being able to orient towards and perform
> > > specific situations that were lived-in (experienced, gone through).
> > > We recur to the notions of place-making and place-imagining to
> > > emphasize this per-formative aspect that has to do with inhabiting a
> > > place and finding one's ways
> > around it.
> > >
> > > We wrote the paper as we were finishing our respective
> > > theses/defenses, and we wanted to do something that should feel fun
> > > and free. We felt that Star's work was broad and were encouraged to
> > > connect different ideas from different scholars. The schedule was
> > > tight, and, although I think we managed to put together some ideas,
> > > we may have taken many risks in bridging across the different
> frameworks.
> > > I hope that those risks taken may now open space for
> > > questions/comments to emerge in the discussion, and I look forward
> > > to
> > learn a lot from them.
> > >
> > > Thanks,
> > > Alfredo
> > >
> > >
> > >  ------------------------------
> > > *From:* lchcmike@gmail.com <lchcmike@gmail.com> on behalf of mike
> > > cole < mcole@ucsd.edu>
> > > *Sent:* 14 July 2015 19:17
> > > *To:* eXtended Mind, Culture, Activity
> > > *Cc:* Rolf Steier; Alfredo Jornet Gil; lchc-l@mailman.ucsd.edu
> > > *Subject:* The Emergence of Boundary Objects
> > >
> > >   If my information is correct, both Alfredo and Rolf have some time
> > > in the upcoming period to discuss their article on the emergence of
> > > boundary objects.
> > >
> > >  So, to start the discussion.
> > >
> > >  I am finding this article enormously generative of ways to think
> > > about some perennial issues that have recently been on my mind. The
> > > entire discussion leading up to the formulation of transforming
> > > spaces into places (and recreating spaces in the process) locks in
> > > directly with our current work on the 5th Dimension, which i have
> > > been writing about for some time as a tertiary artifact and an
> > > idioculture, but which most certainly fits the concept of a boundary
> object.
> > >
> > >  Secondly, I have become really interested in "practices of
> imagination"
> > > and that is just how Alfredo and Rolf characterize their two
> > > installations and the professional teams that cooperate to create them.
> > > And they make a new linkage by referring to distributed imagination,
> > > which is most certainly going to require imagination to fill in the
> > > ineluctable gaps, and provide us with some insight insight into the
> > processes involved.
> > >
> > >  Those are my issues for starters. What strikes others?
> > >
> > >  mike
> > >
> > >  PS--
> > > For those of you who missed this topic, the article is attached.
> > >
> > >
> > >
> > >  --
> > >
> > > Both environment and species change in the course of time, and thus
> > > ecological niches are not stable and given forever (Polotova &
> > > Storch, Ecological Niche, 2008)
> > >
> > >
> > >
> >
>
>
>
>


More information about the xmca-l mailing list