A rubble wall, or as it is more familiarly known in Malta as “Hajt tas-sejjieh”, is one built entirely or mainly without the use of cement or mortar; it relies for its strength and durability on the skilful placing of stones so that each one is locked securely in place. No one who has walked through the countryside can have failed to notice the part that rubble walls play in the agricultural economy. Many, however, accept them as a quaint addition to the rural scene without asking what the walls are doing there. They are so common and characteristic of the local rural scene that they are taken for granted. Only a few people might realize the expertise in this primitive type of wall structure. In order to construct successfully a strong and rigid rubble wall certain important procedures should be adopted and followed. The type of tools and the building material necessary are also important.