Glass breaks in handling, fails at incoming inspection, and gets rejected on site — and the cost lands on whoever cannot prove what happened. Muthari OS is one system where a glazing contractor’s package actually runs: every delivery lands as a batch with a QC decision on record, rejected panes are quarantined or returned to the supplier with the paper trail, only approved stock can be issued, zones move through production with QC before dispatch, a QR on every shipped zone, installation recorded daily, and a site rejection recorded as a rework round with its cause, its photos and its cost. It is built for contractors who fabricate what they install, by contractors in the trade.
Receive 300 of an ordered 500 and the PO shows the balance. Each receipt becomes a batch the QC engineer approves, or splits into approved and quarantined quantities that must add up. Quarantine to supplier return carries a return-note number, and the PO balance reopens. Only approved batches can be issued to a zone.
A pane rejected on site is a typed rework round — site return, damage, QC reject — with the reason, the quantity, the stages it rolls back through, photos stamped with name and time, and the replacement cost recorded against it when commercial certifies it. Rework reporting shows plainly which rounds are costed and which are not.
Zones cannot enter production without an approved drawing and issued material. QC passes the zone before it can be dispatched; the delivery note is server-issued and prints a QR sticker per zone. Site receipt records the receiver name from the POD. Installation is recorded daily against zone quantities the system will not let you exceed.
Progress claims derive previous quantities from the last invoice, so double-claiming cannot happen. Goods receipts and inspection records attach to the claim. Zones that exceed the BOQ quantity trigger a variation before you glaze them for free.
Glass is the least forgiving material on a façade: it is made to order, it cannot be trimmed, and a single damaged pane restarts a lead time that may run to weeks. Almost all glass project control is therefore about identity and condition at the moment of receipt.
Make-up is approved before anything is ordered — thickness, toughened or laminated, the interlayer, coating and its face position, the cavity and spacer on an insulated unit. Processed glass is cut to a size that belongs to one opening, so an approval change after release is not an amendment, it is a re-order.
Units arrive on stillages and A-frames, interleaved, and every pane needs inspecting for edge chips, scratches, coating damage, seal condition and correct orientation before it is accepted. This is the point where a rejection is cheap. A receipt that raises stock, reduces the order balance and puts the batch in front of quality — with the supplier's batch reference recorded per line — is what makes a later replacement argument winnable, because the condition on arrival is on the record rather than in dispute.
Damaged units are quarantined or returned to the supplier with a reference, and the returned quantity reopens the balance on the order so it is genuinely chased. The replacement is the expensive part: it carries its own lead time and its own cost, and whether that cost sits with the supplier, the installer or the project depends entirely on when and where the damage was recorded.
Glass is stored and moved by zone. Handling damage between the store and the opening is common and, without a movement record, indistinguishable from supplier damage.
Installation is recorded per zone against its quantity, with inspections following the work and non-conformances carrying a cause and a closure. Because breakage and replacement are recorded as events with cost rather than absorbed quietly, the commercial position reflects what the package actually consumed.
The same fabricate-and-install spine runs façade and curtain wall packages — the submittal register, profile stock across projects, fabrication stages, deliveries and claims — for contractors who supply the glass and the frame together.
The same operational chain runs every specialist trade — a factory and a site against one contract. Why specialist contractors need a different model, and what construction operations software is. For the broader category, see construction project management software.