The primary productive unit of the survey is the five member field team. It consists of a team leader and four field walkers. They walk an average of slightly over 100 units per day with occasional outings in the mid-100s. We run 5 field teams a day since one team is in the pottery storerooms. It takes field teams about 7 minutes to walk the average unit with some units taking as much as 7 or 8 times that long (and others taking almost no time). Most teams start their first unit a little after 7 am and finish their last unit around 12:45 pm. So our field day runs for about 6 hours (to simplify). The teams walk for about 2 hours, 15 minutes per day (or about a third of the time their in the field). The rest of the day is devoted to filling out forms and traipsing from one unit to the next. Lest this makes our field walkers sound lazy, I should point out that, over the course of our field season field, walkers walked over 1000 km (that over 600 miles for Americans). There’s no lack of energy and commitment on the part of our field walkers!
What I discovered is that the average field team used only 3 walkers for field walking. In fact, the average number of walkers per field was almost exactly 3 (the mode was also 3). This got me thinking that, next year, we should take our 6 field teams of 4 field walkers and divide them into 8 field teams with 3 field walkers. This would have the clear advantage of putting 7 field teams into the field daily (with one team heading to the pottery storerooms each day), and this should increase the number of units walked per day by about 40%.
When I pitched this to a few team leaders, they responded that the teams often used the fourth field walker to help record information when not walking units. If resulted in an increase in efficiency, we should see that 3 walker units are completed more quickly than 4 walker units. The numbers, however, don’t bear this out. Both 3 and 4 walker units get done in about 9 minutes despite 4 walker units being generally longer (by around 25 meters) than 3 walker units. So, there doesn’t seem – on the face of it – to be any real efficiency gained by 3 walker teams. (I do know that some field teams operated at below full strength, but even when I did some rough work to control for this, it didn’t seem to impact the overall numbers very much).
There is one hitch: Around 65% of our units used fewer than 4 walkers, but about 20% units used 4 walkers exactly. But this, I think, is an artifact of our units being mapped to accommodate 4 walker teams. This might account for why units with more than 4 walkers (but less than 9) average about 11 minutes which is a substantial increase over those with 3 or 4. This is the result of teams having to double walk the unit; that is: walkers having to walk the unit once and then again. Curiously, the 11 minute average is not twice the time taken to walk a unit where every walker walks only once. This is probably because we tended to make larger units from areas where the fields are disturbed and unlikely to produce much pottery. While I haven’t run the numbers recently, historically our ceramic densities decline as unit size increases. So, I suspect one thing that might happen if we shrink our field teams is that we’d shirt our unit size to accommodate the smaller teams. So we’ll do more units, but maybe not survey more ground.
Of course, to make this all work, we have to find two more excellent team leaders to complement our fine group of six. Moreover, we’d have less margin of error for individual teams. This year we lost a few field walkers each week to ailments ranging from dehydration to sea urchin attacks. Teams dropping to two walkers would struggle to be flexible enough to walk large units and would probably suffer just walking average sized units.
Embiggening the number of teams (by debigulating the number of walkers) might also lead us to increase the number of cars and would almost certainly require us to increase the number of devices assigned to team (cameras, GPS units, Sharpies, et c.). But as a good buddy once quipped, if you can’t afford to do maximum archaeology, perhaps you should just stay in the library.