A method of assembling an article of footwear incorporating a knitted component (2000, 2500) into an upper, the method comprising: forming the knitted component (2000, 2500) in a planar configuration including a first edge (1902, 2530, 2524, 2532, 2546, 2550, 2554) and a second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552); the knitted component (2000, 2500) being formed of courses which are secured: knitting a joining thread (1840, 2501, 2503, 2505, 2507, 2509, 2511) between the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) and the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552) in a planar configuration, the joining thread (1840, 2501, 2503, 2505, 2507, 2509, 2511) including a first end (1270, 2102) and a second end, at least one of the first end (1270, 2102) and the second end being unsecured, the joining thread (1840, 2501, 2503, 2505,2507,2509,2511) interlooping with at least one loop on the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) and the joining thread (1840, 2501, 2503,2505,2507,2509,2511) interlooping with at least one loop on the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552); tensioning at least one of the first end (1270, 2102) and the second end of the joining thread (1840, 2501, 2503, 2505, 2507, 2509, 2511) such that the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) and the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552) extend toward one another; incorporating the knitted component (2000, 2500) into the upper of the article of footwear, and wherein the upper of the article of footwear includes a lateral side and a medial side, characterised by the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552) both being located on the lateral side or the medial side. forming the knitted component (2000, 2500) in a planar configuration including a first edge (1902, 2530, 2524, 2532, 2546, 2550, 2554) and a second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552); the knitted component (2000, 2500) being formed of courses which are secured: knitting a joining thread (1840, 2501, 2503, 2505, 2507, 2509, 2511) between the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) and the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552) in a planar configuration, the joining thread (1840, 2501, 2503, 2505, 2507, 2509, 2511) including a first end (1270, 2102) and a second end, at least one of the first end (1270, 2102) and the second end being unsecured, the joining thread (1840, 2501, 2503, 2505,2507,2509,2511) interlooping with at least one loop on the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) and the joining thread (1840, 2501, 2503,2505,2507,2509,2511) interlooping with at least one loop on the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552); tensioning at least one of the first end (1270, 2102) and the second end of the joining thread (1840, 2501, 2503, 2505, 2507, 2509, 2511) such that the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) and the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552) extend toward one another; incorporating the knitted component (2000, 2500) into the upper of the article of footwear, and wherein the upper of the article of footwear includes a lateral side and a medial side, characterised by the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552) both being located on the lateral side or the medial side. knitting a joining thread (1840, 2501, 2503, 2505, 2507, 2509, 2511) between the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) and the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552) in a planar configuration, the joining thread (1840, 2501, 2503, 2505, 2507, 2509, 2511) including a first end (1270, 2102) and a second end, at least one of the first end (1270, 2102) and the second end being unsecured, the joining thread (1840, 2501, 2503, 2505,2507,2509,2511) interlooping with at least one loop on the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) and the joining thread (1840, 2501, 2503,2505,2507,2509,2511) interlooping with at least one loop on the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552); tensioning at least one of the first end (1270, 2102) and the second end of the joining thread (1840, 2501, 2503, 2505, 2507, 2509, 2511) such that the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) and the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552) extend toward one another; incorporating the knitted component (2000, 2500) into the upper of the article of footwear, and wherein the upper of the article of footwear includes a lateral side and a medial side, characterised by the first edge (1902, 2524, 2530, 2532, 2546, 2550, 2554) the second edge (1952, 2526, 2528, 2534, 2544, 2548, 2552) both being located on the lateral side or the medial side.