Guestimates (hours), including low-level design, implementation, test cases, review, post-review fixes, and documentation. Note that without low-level designs, and with no prior experiences with estimating MariaDB work, these are little more than wild guesses: MWL#36: Option 1: 12+24+5+2+4+2 = 49 Option 2: 8+24+5+3+3+4 = 47 Option 3: 9+22+9+4+3+5 = 52 MWL#37: 6+12+4+2+2+4 = 30 MWL#38: 8+17+4+2+2+4 = 37 MWL#40: Option 2.0: 4+11+4+2+2+4 = 27 Option 2.1: Not estimated. Option 2.2: Not recommended. Option 2.3: 14+22+3+3+5 = 47 Option 2.4: 14+25+7+4+4+5 = 59 MWL#41: Option 1: Not estimated. Option 2: 20+25+15+3+6+8 = 77 Option 3: 10+15+7+3+6+4 = 45 I don't think all of the options are independent, some of them should be chosen together for consistency. Eg. MWL#36/3 and MWL#40/2.4 and MWL#41/3. Here are some suggested overall choices: 1. Minimal/RBR only. MWL#36/1 + MWL#40/2.0 + MWL#41/2 2. Partial SBR support, but with some inconsistencies: MWL#36/2 + MWL#40/2.0 + MWL#41/2 3. Complete SBR support, with server-side support: MWL#36/3 + MWL#40/2.4 + MWL#41/3 - Kristian.