2c:null 2d:["$","title",null,{"children":"Impact of Multiple Team Dependencies in Software Development | Troy Magennis | Observable"}] 32:[] 30:{"id":"6d99797491343997","slug":"impact-of-multiple-team-dependencies-in-software-developm","title":"Impact of Multiple Team Dependencies in Software Development","thumbnail":"49e3b8e7b5c25c76853ac31b4ed41e895e2facb91573182f4e68e995d0ccb899","access_level":"public","create_time":"$D2019-07-25T16:23:09.201Z","update_time":"$D2021-09-16T15:15:35.724Z","view_time":null,"first_public_time":"$D2019-07-28T20:16:07.442Z","fork":false,"stars":6,"starred":false,"owner":{"type":"team","id":"5bfcd1f236454eeb","login":"troymagennis","name":"Troy Magennis","avatar_url":"https://avatars-next.observableusercontent.com/bd84c523cb40d1d089b9d8d0a4ac5e025e3593ce8554df5d578d6da6190496c5","tier":"starter_2024"},"version":187,"publish_version":187,"role":null,"authored":false,"authors":[{"type":"individual","id":"f950cac864488237","login":"troymagennis","name":"Troy Magennis","avatar_url":"https://avatars-next.observableusercontent.com/bd84c523cb40d1d089b9d8d0a4ac5e025e3593ce8554df5d578d6da6190496c5","tier":null}],"members":[{"type":"individual","id":"f950cac864488237","login":"troymagennis","name":"Troy Magennis","avatar_url":"https://avatars-next.observableusercontent.com/bd84c523cb40d1d089b9d8d0a4ac5e025e3593ce8554df5d578d6da6190496c5","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":3,"collection":{"id":"e353f61379db4140","slug":"agile-software-development","title":"Agile Software Development","owner":{"id":"5bfcd1f236454eeb","login":"troymagennis","name":"Troy Magennis"}},"type":"notebook","body":{"title":"Impact of Multiple Team Dependencies in Software Development","cells":[{"id":0,"value":"md`# Impact of Multiple Team Dependencies in Software Development`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":2,"value":"md `As delivery organizations scale some features require more than one team to design, build and deploy. Some organizations have made teams formed around products (versus architecture) and this can reduce these dependencies. Inevitably though, if you were to reduce dependencies too low, team sizes would be larger and specialist skills occassionaly needed would be dispersed in many places. It is important to balance reducing dependencies with excessive team size - zero isn't the goal, but how impactful are dependencies? And how many is too many? This article explores these questions.`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":103,"value":"md`## What is the Chance of Being On-time?\nFor every step of building something (dependencies), that step can be on-time or delayed. If we want to know the chance of each dependency being on-time, it will be 1 chance in ${tex`\\mathbb 2^n`} (where n = number of dependencies).\n\nTo visualize the on-time chance, set the slider to the number of dependencies you have in your environment. The blue square is on-time, and the orange squares are delayed by at LEAST ONE dependency. Every dependency you can remove DOUBLES your chances of success of n-time deivery`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":118,"value":"md `**Number of dependencies** (teams needed, approvals, etc): **${numberOfDependencies}**`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":120,"value":"viewof numberOfDependencies = html``","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":150,"value":"md `On-time delivery chance **1 in ${permutations}**.
\nAT LEAST one dependency being delayed is **${permutations-1} times** MORE likely.`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":125,"value":"{\n const { margin, squareSize, squareCol, squareBgd, strokeCol, strokeWidth, value, count, columns } = configPerms\n\n const size = (squareSize + (strokeWidth * 2)) * columns\n const svg = DOM.svg(size, size)\n const sel = d3.select(svg)\n \n const scale = d3.scaleLinear()\n .domain([0, columns])\n .range([0, size])\n\n const join = sel.selectAll('rect')\n .data(d3.range(count)) //value\n\n join.enter().append('rect')\n .attr('x', (d, i) => {\n const n = i % columns\n return scale(n)\n })\n .attr('y', (d, i) => {\n const n = Math.floor(i / 25)\n return scale(n)\n })\n .attr('width', squareSize)\n .attr('height', squareSize)\n .attr('stroke-width', strokeWidth)\n .attr('stroke', strokeCol)\n .merge(join)\n // note < not <= as counting from 0\n .transition()\n .attr('fill', (d, i) => (i < value) ? squareCol : squareBgd)\n \n return svg\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":177,"value":"md `## Why?\nIf only one team was involved in delivery, there are only two possibilities; One is they deliver on-time and the other is they deliver late. If two teams are needed, then there is one chance BOTH of those teams deliver on-time, and three chances that either one or both of them are late. No matter how many teams are involved, there will only EVER BE ONE chance all of those teams deliver on-time and all other possibilities are at least one or multiple teams are delayed. \n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":183,"value":"md `

\n#### Training and consulting - contact us...\nFocused Objective offers training and consulting on metrics and forecasting applied to software development. If you are interested in on-site or public workshops to teach how to plan and manage software development using practical and proven techniques please email me: [troy.magennis@focusedobjective.com](mailto:troy.magennis@focusedobjective.com). If you are interested in following more of my work on Twitter connect at [@t_magennis](http://twitter.com/t_magennis). Always happy to spend an hour on the phone to see if I can help in any way.\n

`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":114,"value":"md `### Formulas and inner workings. Ignore unless interested.`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":127,"value":"configPerms = ({\n \tvalue: 1,\n count: permutations,\n columns: 25,\n squareSize: squareSize,\n squareCol: 'blue',\n squareBgd: 'orange',\n strokeCol: 'white',\n strokeWidth: 2,\n margin: {\n top: 5,\n right: 5,\n bottom: 5,\n left: 5\n }\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":122,"value":"permutations = Math.pow(2,numberOfDependencies)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":70,"value":"d3 = require(\"d3@5\")","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":65,"value":"md`size of squares: ${squareSize}`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":64,"value":"viewof squareSize = html``","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W32","stdlib":"1","titling":"auto"}} 31:"$30:body"