I know this is an old thread. Just rediscovered
it as I was cleaning my mailbox.

I wondered about this for a long time, until I
found out how the Buddha defined sampajana in SN 47:35:

And how, monks, is a monk clearly knowing?
Here, monks, a monk’s feelings are known when
they arise, known when they remain present and known when they go away;
[his] thoughts are known when they arise, known
when they remain present and known when they go away;
[his] perceptions are known when they arise,
known when they remain present and known when they go away.
It is in such a way, monks, that a monk is clearly knowing.
Monks, a mindful monk should dwell clearly
knowing. This is our instruction to you.

So, it seems that sampajana refers to being aware
of the activities of feelings, thoughts, and
perceptions, while engaging in any physical activities.

frank wrote thus at 01:03 AM 06-02-12:

>Dear Pāḷi friends,
>
>In MN 119, mindfulness immersed in the body sutta, "walking, standing,
>sitting, lying down" is covered twice. Once under the section of
>postures with "pajānati", and again in the next section of
>"sampajānakārī " .

<snip>

>So how are the differences to be understood, with respect to
>"walking/standing/sitting/lying" in "pajānati" versus "sampajānakārī "?
>My question on this is primarily motivated by how to fine tune
>meditation and satipatthana practice.

[Non-text portions of this message have been removed]