UNCLASSIFIED A System Dynamics model of the FM 3-24 COIN Manual CAPT Brett Pierson Warfighting Analysis Division J8/WAD 1 UNCLASSIFIED UNCLASSIFIED Assess the Full Range of Military Operations • Warfighting analysis – assess proficiency – Multiple scenarios – Wide range of variables within scenarios – Alternative CONOPs – Alternative campaign objectives – Force equivalencies/force substitution – Multiple analytical models • Other force structure requirements – assess sufficiency – Day–to–day demands: Forward basing, forward presence, lesser contingencies, homeland defense, theater security cooperation – Peak demand of overlapping warfights – Sustained surge demand of post-hostilities operations – Force equivalencies/force substitution • Analysis of Irregular Warfare challenges 2 UNCLASSIFIED UNCLASSIFIED Analysis Framework Tools • Workgroups • Mission Analysis • Data • Models • Scenarios • Metrics • Wargaming • Interagency partners • Senior Leader reviews Methodologies • Intellectual approach • Rationale • Physical assumptions Study Objective • Philosophical assumptions • Senior Leader insights • Tank guidance • SPG tasks • Peer reviews • Partner nations 3 UNCLASSIFIED UNCLASSIFIED Comparison of Traditional and Non-Traditional Analysis Conventional Campaigns Non-Traditional Campaigns System Dynamics, AgentBased Models, Wargames, …. JICM, ITEM, Thunder, … Characteristics “Victory” clearly defined, quickly understood, well-established Metrics Focused on Phase III Operations, approved MSFDs (MCOs) Scenarios More than Phase III Operations, draft vignettes, wargames for event list Data Perishable, culturally relevant, “soft” aspects, questionable reliability, noJMEM equivalent Physics based, authoritative sources identified, JMEM (historical, published, formatted) DoD centric, generally accepted; historic, repeatable validation Physical warfight outcomes, measurable and explainable 4 Interactively complex; global focus; human, social, cognitive domain, means integrate all elements of National Power (DIME) Structurally complex, limited geographic focus, kinetic domain, means are predominately Military Many on-going efforts to define “Victory” (JCS J5, SOCOM J3/J5) Models Expertise outside DoD; exploring nonDoD models; still in research mode; structural validation, “useful/credible” Results Identify “High Leverage” areas and trends; insights on capabilities “backed-out” and often not DoD 4 UNCLASSIFIED UNCLASSIFIED Analysis in Irregular Warfare Triangulation Search in the Physical World Sensor 1 Uncertainty Space in the Analytic World Sensor 2 SME and Theory Experts Sensor 3 Historic Analogy Analytic Models and Wargames Uncertain distance with known error Uncertain error with known distance Efforts to refine the solution risk missing a fleeting opportunity to attack 5 UNCLASSIFIED UNCLASSIFIED Why System Dynamics Modeling? • Characteristics of systems problems include: – Dynamic—changes over time and inherent system delays – Tendency to overshoot and crash or oscillate – Frequent over-reactions that drive exponential growth in costs – Multiple players, diverse interests – Interdependencies across borders and across disciplines – Proposed solutions that appear simple and are usually wrong – Very difficult to communicate! • System Dynamics Modeling can add value in several areas. It provides a platform for… – Effectively framing issues and problems. – Representing the essence of the interdependencies that underlie system performance; minimize policy resistance – Reliably inferring the dynamics associated with a set of initiatives – Communicating—creating a single “sheet of music” to play Excerpts from “An Introduction to Dynamic Modeling with STELLA & iThink” Workshop 6 UNCLASSIFIED UNCLASSIFIED System Dynamics Disclaimer • Various software and consultants being used within DOD – STELLA / iTHINK – modeling software – VENSIM – modeling software – PA Consulting / Boeing / VMASC / MIT – consultants using a mix of commercial and proprietary software to develop SD solutions Excerpts from “An Introduction to Dynamic Modeling with STELLA & iThink” Workshop 7 UNCLASSIFIED UNCLASSIFIED System Dynamics Software • STELLA / iTHINK – isee systems – Barry Richmond • Language of stocks and flows, graphics user interface • Innovator in application to social systems – “STELLA in the classroom” to study Hamlet in High School 8 UNCLASSIFIED UNCLASSIFIED Building a Simple STELLA Model Savings account • Stock – savings • Flows in – deposits and interest • Flows out – withdrawals • Simulation – what is the effect of various interest rates? How about deposits and withdrawals? Where is my leverage? Most of the things that concern people are entities that accumulate or dissipate over time – and we are concerned with trends. Unlike the simple example above, most don’t have a closed-form solution 9 UNCLASSIFIED UNCLASSIFIED Using a STELLA-Based Presentation • Begin with a cause and effect relationship diagram • Expand into a model structure that captures all elements and assigns assumptions about relationships • “Troubleshoot” model structure and validate against some sort of truth data…historical data, research, or in this case doctrinal theory 10 UNCLASSIFIED Potential Fractiousness of Society Support for Insurgency Neutral Populace COIN operations must accomplish three tasks simultaneously: • Influence insurgent-minded individuals to adopt a neutral disposition. • Influence neutral-minded individuals to adopt a supportive disposition. • Retain supportive individuals. These operations are conducted in an environment where tensions and hostilities between groups may destabilize a society and provide opportunities for insurgents • This environment may suggest courses of action aimed at reinforcing or widening seams Support for HN Government • An increase in Coalition funding will influence economic investment and development. Coalition Funding • A strengthened economy will influence movement from the insurgent- and neutral-minded groups toward the supportive group. Economic Investment Potential Fractiousness of Society Support for Insurgency Economic Development Neutral Populace Support for HN Government Developing and Restoring Essential Services Breakdown of Essential Services Essential Services Time to Develop Essential Services Coalition Funding Satisfaction with Essential Services Economic Investment Expectations for Essential Services Potential Fractiousness of Society Support for Insurgency • An increase in Coalition funding will significantly impact the restoration of essential services. • Improvements in the provision of essential services will influence movement from the insurgent- and neutral-minded groups toward the supportive group. Economic Development Neutral Populace Support for HN Government Developing and Restoring Essential Services Breakdown of Essential Services Time to Develop Governance Psychological Operations Effectiveness Governance Potential Fractiousness of Society Support for Insurgency Economic Development Neutral Populace Support for HN Government Available Workforce Perceived Security External Material Support A government that is established, recognized, and that maintains a secure environment is in a position to • Send a positive, credible message of success to the populace. • Provide an environment that enhances stable employment of the workforce. • Persuade insurgents and neutrals to consider becoming supporters. Coalition Funding Economic Investment Expectations for Essential Services Essential Services Time to Develop Essential Services Satisfaction with Essential Services Insurgent Acts of Violence Developing and Restoring Essential Services Breakdown of Essential Services Expectations for • The restoration of essential services. Essential Services Governance • The populace’s perception of security. Essential Services Time to Develop Essential Services Coalition An appropriate Satisfactionforce with mix, and correct operational Funding Time to Develop tempo,Essential timing,Services and synchronization will have very Governance significant impacts on Psychological Operations Effectiveness • The Government’s and COIN forces’ credibility in Potential their communications efforts with the populace. Economic Fractiousness Support for Insurgency Impact of Illegitimate Actions Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Appropriate Strategic Emphasis Insurgent to Force Density Ratio Understanding and Knowledge of Social Structures Economic Investment of Society Development Neutral Populace Support for HN Government Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Total Force Density Coalition Force Density Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Understanding and Knowledge of Social Structures Governance Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Coalition Funding Economic Development Neutral Populace Support for HN Government Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Total Force Density Coalition Force Density Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Governance Economic Development Neutral Populace Support for HN Government Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Coalition Funding Total Force Density Understanding and Knowledge of Social Structures Coalition Force Density The Logical Lines of Operations from FM 3-24 Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Understanding and Knowledge of Social Structures Governance Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Economic Development Neutral Populace Support for HN Government Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Total Force Density Coalition Force Density The Basic Information Ops Loop Coalition Funding Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Governance Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Coalition Funding Understanding and Knowledge of Social Structures Economic Development Neutral Populace Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Total Force Density Coalition Force Density The Comprehensive Information Loop Support for HN Government Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Governance Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Coalition Funding Understanding and Knowledge of Social Structures Economic Development Neutral Populace Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Total Force Density Coalition Force Density The Comprehensive Information Loop Support for HN Government Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Governance Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Coalition Funding Understanding and Knowledge of Social Structures Economic Development Neutral Populace Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Total Force Density Coalition Force Density The Comprehensive Information Loop Support for HN Government Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Governance Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Coalition Funding Understanding and Knowledge of Social Structures Economic Development Neutral Populace Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Total Force Density Coalition Force Density The Comprehensive Information Loop Support for HN Government Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Governance Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Coalition Funding Understanding and Knowledge of Social Structures Economic Development Neutral Populace Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Total Force Density Coalition Force Density The Comprehensive Information Loop Support for HN Government Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Governance Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Coalition Funding Understanding and Knowledge of Social Structures Economic Development Neutral Populace Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Total Force Density Coalition Force Density The Comprehensive Information Loop Support for HN Government Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density Developing and Restoring Essential Services Satisfaction with Essential Services Breakdown of Essential Services Time to Develop Essential Services Psychological Operations Effectiveness Appropriate Mix of Effort and Use of Force Individual Competence, Judgment, and Ability to Execute Governance Economic Development Neutral Populace Support for HN Government Available Workforce Perceived Security External Material Support Insurgent Acts of Violence Appropriate Strategic Emphasis Insurgent to Force Density Ratio Economic Investment Potential Fractiousness of Society Support for Insurgency Impact of Illegitimate Actions Time to Develop Governance Expectations for Essential Services Essential Services Coalition Funding Total Force Density Understanding and Knowledge of Social Structures Coalition Force Density The Logical Lines of Operations from FM 3-24 Intelligence Time to Develop HN Security Forces Host Nation Security Forces Host Nation Force Density UNCLASSIFIED 26 The STELLA Model - Interfaces 26 UNCLASSIFIED UNCLASSIFIED The STELLA Model - Structure Population Essential Services Governance Host Nation Security Forces Economic Development Security 27 27 UNCLASSIFIED UNCLASSIFIED The STELLA Model Support for Insurgency 28 Neutral Populace 28 Support for HN Government UNCLASSIFIED UNCLASSIFIED Using the Model in Analysis COA Option – Adjust Mix of Effort and use of Force to focus totally on security – Technology-driven and reactive cost imposing strategy – Ignores FM 3-24 recommended effort on non-security LLOs 1: Support f or Gov ernment 1: 2: 3: 1: 2: 3: 2: Support f or Insurgency 1: Support f or Gov ernment 3: Neutral 1: 2: 3: 100 50 1: 2: 3: 1 3 2: Support f or Insurgency 50 3 2 3 2 3 1 3 2 2 3: Neutral 100 2 1 1 1 3 1 2 1: 2: 3: 1: 2: 3: 0 1.00 Page 1 31.00 61.00 Months 91.00 0 1.00 121.00 Page 1 2:35 PM Wed, Oct 24, 2007 31.00 61.00 Months 91.00 121.00 4:31 PM Wed, Oct 24, 2007 Untitled Untitled Appropriate mix of effort set to a balanced focus on all Logical Lines of Operation All effort focused on Perceived Security and Host Nation Security Forces, others zero Waiting to start on the Non-Security LLOs until Security is established is an inherently flawed and self defeating strategy. The LLOs are too interdependent. 29 UNCLASSIFIED UNCLASSIFIED Optimizing a Solution 1: Support f or Gov ernment 1: 2: 3: 1: 2: 3: 2: Support f or Insurgency 3: Neutral 100 1 50 3 3 1 3 1 2 2 2 1: 2: 3: 0 1.00 31.00 61.00 Page 1 Months 91.00 121.00 7:49 AM Tue, Oct 30, 2007 Untitled with balanced of effort on LLOs “One of the mostResults important lessons inmix Afghanistan and incombined Iraq is that military with slightOur reduction External anddevelopment, success is not sufficient. effortsinmust alsoMaterial addressSupport economic slightthe reduction Potential Fractiousness Society institution building, rule ofinlaw, promoting internalofreconciliation, good or at least decent governance, public services, training and equipping indigenous security forces, effective, strategic communications, and more.” Secretary of Defense Robert Gates, 29 January 2008 30 UNCLASSIFIED UNCLASSIFIED Coalition Input – Optimized 3-24 case Manning and Funding held sufficient through the entire period A sustainable peace – we remain involved and remain invested as intervener 31 UNCLASSIFIED UNCLASSIFIED Coalition Input – Kilcullen case Manning and Funding get ramped down as Host Nation capacity increases A durable peace – one left to thrive as a better version of itself with less cost to us 32 UNCLASSIFIED UNCLASSIFIED Coalition Input – Ramped up effort case Manning and Funding get ramped up as needed to face crises No peace – mired in strife at the same cost to us as Kilcullen case over the period 33 UNCLASSIFIED UNCLASSIFIED Coalition Input – the long slow grind Eventually the corner is turned – assuming no return to major hostilities Requires persistent sufficient investment many times longer despite greater losses 34 UNCLASSIFIED UNCLASSIFIED Is It Working? “..in this agrarian area where date palms outnumber buildings…” (Knowledge and Understanding of Social Structure) “..four IED attacks…” (Insurgent Acts of Violence) “…he will renew the contracts…” (Economic Development) “…is distrustful of the government…” (Psychological Operations Effectiveness) “…concerned citizens are being paid…” (Economic Development) (Governance) “...they will become members of the Iraq security Forces.” (Host Nation Security Force Development) “They are making their community safe” (Perceived Security) “..it is a security program, not an attempt to create armed militias…” (Perceived Security) “…install security among all tribes, not just Sunni…” (Potential Fractiousness) “…political infighting…” (Governance) “…counter false perceptions…” (Psychological Operations Effectiveness) “…the money they receive…” (Economic Development) Christian Science Monitor – October 2nd 2007: “Violence dropped dramatically” Credit for success is given to efforts that directly map to FM 3-24 35 UNCLASSIFIED UNCLASSIFIED Contextual Mapping Perceived Security Desired Outcome 3: xxx.xxxx Metric(s) Bella Overall Status Significant Activities Status/Trend Large gray SUV with a great Governance number of ameneties Desired Outcome 3:Brand xxx.xxxx Overall new Ducati that goes veryStatus Anna fastActivities Metric(s) Significant Status/Trend Old 1974 Camaro that has been Large gray Old White Dog SUV with a great Essential Services Bella around for a number of years number of ameneties A very nice Harley Davidson Desired OutcomeOld 3:Brand xxx.xxxx Overall veryStatus Bluenew Ducati that goes Anna that I bought from my Dad fast Metric(s) Significant Activities Status/Trend Old 1974 Camaro that has been Large gray with a great Old White Dog SUVForces Security BellaHost Nation around for a number of years number of ameneties A very nice Harley Davidson Desired OutcomeOld 3:Brand xxx.xxxx Overall veryStatus Bluenew Ducati that goes Anna that I bought from my Dad fastActivities Metric(s) Significant Status/Trend Old 1974 Camaro that has been Large gray Old White Dog SUV with a great Development Bella Economic around for a number of years number of ameneties A very niceOverall Harley Davidson Desired OutcomeOld 3:Brand xxx.xxxx veryStatus Bluenew Ducati that goes Anna that I bought from my Dad fast Metric(s) Significant Activities Status/Trend Old 1974 Camaro that has been Large gray SUV with a great Old White Dog Bella around for a number of years number of ameneties A very nice Harley Davidson Brand Old Bluenew Ducati that goes very Anna that I bought from my Dad fast Old White Dog Old Blue Contextual Mapping helps metrics point towards the appropriate LLOs Old 1974 Camaro that has been around for a number of years A very nice Harley Davidson that I bought from my Dad What can you say about these except “I hope they start getting greener” To be useful, metrics need a contextual mapping, which infers a framework 36 UNCLASSIFIED UNCLASSIFIED Campaign Design TRADOC Pamphlet 525-5-500 “Commander’s Appreciation and Campaign Design” • Commander’s Appreciation – Need to develop a shared understanding of complex operational problems – Structured problem framing (and re-framing!) • Problem structure – well structured (structurally complex, linear): professionals agree on how to proceed – apply the Science of War – ill-structured (interactively complex, nonlinear): professionals disagree on how to solve this problem – apply the Art of War Topic of Army ‘Stand-To’ e-newsletter, 1 Feb 2008 To access TRADOC Pamphlet 525-5-500 go to: http://www.tradoc.army.mil/tpubs/pamndx.htm 37 UNCLASSIFIED UNCLASSIFIED A System Dynamics View of Campaign Design Commander's Appreciation and Campaign Design Understanding is not a matter of capturing reality sufficiently correctly, [it is a matter of] constructing an interpretation that is sufficiently useful in dealing with reality Art of War Link near-term actions to the strategic aim of the campaign Intuition and Genius (harmonious combination of courage, powers of intellect, and strength of will) Gap in "State of Affairs" between what is and what ought to be Concern to lessen or a Military Action to achieve an end state Campaign plans at each level should nest in the same way that tactical orders do Operational Art Complex Operational Problem (unstructured problem) Reframing as understanding expands Detailed series of executable missions that directly affect allies, adversaries, and the environment Operational Problem (well or medium structured) linear phenomena that can be controlled professional soldiers can agree professional consensus and authoritatively prescribed in doctrine Agreement on a Shared Starting Hypothesis doctrine, training, and leader development 1) Seeks to explain the qualitative relationships embedded within complex problems 2) Arranges operations is space and time and identifies capabilities and resources Giving a Complex Problem enough structure so that further planning can lead to useful action Simultaneously building and understanding of the problem through the creation of a conceptual solution or design Commander's Appreciation Operational Design An iterative process that integrates ends, ways, and means across the levels of war Resolving the natural tension between the formulation of strategy and the planning for its implementation Problem framing—and its military use during a campaign Mutually respectful competition of opposing ideas (candid and free) Analysis of the Mission (breaking it down into specified, implied, and essential tasks) 1 2 Action(s) to be Taken Detailed plan for action (blueprint) Operational Engineering Science of War easy to control through technical reduction and a systematic method-based solution 38 UNCLASSIFIED UNCLASSIFIED A Framework for Success Three Completely Different entities – The DoD; The USIP; and Dr. Paul Collier, an Oxford Economist with a lifetime of working aid issues in Africa Safe and Secure Environment Security Rule of Law Laws and Charters Stable Democracy Trade Sustainable Economy Aid Social Well Being Security Host Nation Security Force Development Governance Economic Development Essential Services Since these disparate groups can agree on the problem statement and solution path, how are we in the USG working together to operationalize the answer? 39 UNCLASSIFIED UNCLASSIFIED The STELLA Model – Demo/Questions “Success will be less a matter of imposing one’s will and more a function of shapingwill behavior friends,ofadversaries, and will mostand importantly, the of “Success be less of a matter imposing one’s more a function people in between.” shaping behavior of friends, adversaries, and most importantly, the people in between.” Secretary of Defense Robert Gates, 10 October 2007 Secretary of Defense Robert Gates, 10 October 2007 “You don't kill or capture your way out of an industrial strength insurgency.” Gen. David Petraeus, 14 September 2008 Support for Insurgency 40 Neutral Populace 40 Support for HN Government UNCLASSIFIED