The Blank Scouting Sheet and Vietnamese Volleyball's Data Gap

Eleven at night, and I reopen the scouting sheet I spent two weeks preparing. Nine sections. Every one of them carries the same line: insufficient information, cannot assess. I needed to know how the opposing setter distributes the ball when the first touch lands with the libero, how their opposite hitter works against a two-player block, which zone they serve into when they are trailing. The sheet came back with one sentence, repeated nine times. In twenty-two years of commentating finals I have held every kind of internal document: good ones, bad ones, careless ones. A file in which every data field is empty, and the emptiness itself is recorded in one tidy administrative sentence, is a first.

What bothers me is not the emptiness. It is the way people accept it.

Vietnamese volleyball is in its best stretch in decades. The women's team won SEA Games 31 gold in 2026 on home soil in Hanoi, ending Thailand's long regional dominance. Tran Thi Thanh Thuy went abroad to play in Japan and returned with a different physical presence. Nguyen Thi Bich Tuyen is the irreplaceable opposite in the domestic league, Doan Thi Lam Oanh sets the rhythm, Nguyen Thi Kim Lien sweeps the back court. The national championship now has sponsors, television, packed stands.

The data layer did not grow with it. In Japan's league, every match produces a per-player stat sheet anyone can download. Italy's Serie A1 publishes play-by-play. Korea ties its statistical system directly to broadcast rights. At home, a perfect-pass rate printed in a newspaper is usually typed by hand by one person sitting in the stands, three hours after the match has ended.

Five families of numbers exist in any professional volleyball system. Attack efficiency, meaning points minus errors. Blocks per set. Aces against service errors. Perfect-pass rate. Dig rate. All five need a shared definition before they need an actual number.

Take the smallest example. A swing by the opposite hitter. The ball comes back off the block: an attack error. The ball flies out of bounds: also an attack error, but for a very different reason. The ball is picked up by the opposing libero: a good defensive play. Three people in three corners of the gym can record three versions. Add them together and you get a meaningless number.

So what does a coach actually need from these numbers? He needs substitution timing. In a set to 25, if the perfect-pass rate of one rotation drops below threshold, the setter loses his middle options, the ball goes to the antenna, and the opposing block simply fans out. Without the number, the coach substitutes on feel. Feel is usually four to five points late.

He also needs the reception system choice. Two passers or three depends on how hard the opponent serves and where the libero stands. That decision cannot rest on memory of last season's meeting, when the other side has already replaced two players.

The real problem is not that we lack data. It is that we have no shared definition for each data point. Adding data to a system without standards only makes the noise louder, not the decisions sharper. That is the honest answer to the blank sheet.

Every crisis on court begins with an out-of-rhythm number nobody wants to look at. That rhythm can be a stuck rotation, a libero standing half a metre out of place, a setter putting the ball half a hand too high. At 61, I trust three things that have been tested: data, structure, and instinct forged by failure. Two of the three are missing in Vietnamese volleyball.

Here I have to argue against myself. Faith in data slides very easily into a new religion, and I have watched it slide many times.

There are forty-page reports full of charts that leave a coach still unable to say at which score he should substitute. Imported numbers are more dangerous still. An attack efficiency of 45 per cent in Japan, where the average block stands above 1.90 metres, cannot be compared directly with 45 per cent in the domestic league, where the block is shorter and the blocking schemes are entirely different. Reuse a number without adjusting for opponent quality and you are comparing two things that do not share a unit.

The bigger blind spot is the belief that missing data is an answer. In scouting, insufficient information means there is more work to do. When an entire department writes that sentence into nine boxes, the gap has been legitimised into a result.

And one more thing few people want to hear. Teams do not collapse because they lack dashboards. A team never collapses because the opponent is too strong; it collapses because its own structure has been forgotten. A dashboard helps you remember faster. It cannot remember for you.

I am setting two tests for myself, and anyone else can run them.

In the coming national league season I will check whether any club publishes a complete per-match stat sheet, and whether the phrase "perfect pass" is defined the same way at two different clubs.

At the next match between the women's national team and one of Asia's top four, I will count the points Vietnam loses after the 20 mark in the deciding set, and record whether the reception system changed before or after that run.

Players change, coaches change structures, fate changes scripts, and I just sit and write it all down again. The blank sheet will not fill itself tonight.