IU Health Ball Nursing Book & Journal Publications



P. Avila, H. Beane, D. Bousman, D. Brown, S. Cadogan, G. Coers, S. Craig, C. Davis, L. Delaney, C. Drown, J. Duncan, T. B. Gant,
R. Harbison, D. Harris, H. M. Jones, M. Kidd, J. Kitterman, K. Kring, P. May, E. McIntire, A. Neal, A. Olynger, K. Osborne, N. Paul,
A. Petty, T. Riegle, C. Riwitis, G. Rook, D. Siela, A. Spradlin, R. Twibell, N. Waters,
Patricia Avila
Author(s): K Renee Twibell, Debra Siela, Lori Delaney, Patricia Avila, Allison M Spradlin, Gena Coers
Title: Perspectives of Inpatients With Cancer on Engagement in Fall Prevention
Journal: Oncol Nurs Forum. 2020 Jul 1;47(4):457-468. doi: 10.1188/20.ONF.457-468.

Author(s): Patricia Frist Avila, K Renee Twibell, Heather Demaree
Title: Preventing Health Care-Associated Infections Through Implementation of an Interprofessional Visual Management Safety Tracker
Journal: J Nurs Care Qual. 2022 Jul-Sep;37(3):231-237. doi: 10.1097/NCQ.0000000000000621. Epub 2022 Feb 28.

Heather Beane
Author(s): Renee Samples Twibell, Debra Siela, Alexis Neal, Cheryl Riwitis, Heather Beane
Title: Family Presence During Resuscitation: Physicians' Perceptions of Risk, Benefit, and Self-Confidence
Journal: Dimens Crit Care Nurs. 2018 May/Jun;37(3):167-179. doi: 10.1097/DCC.0000000000000297.

Denise Bousman
Author(s): Twibell RS, Siela D, Riwitis C, Wheatley J, Riegle T, Bousman D, Cable S, Caudill P, Harrigan S, Hollars R, Johnson D, Neal A. School of Nursing, Ball State University, Ball Memorial Hospital, Muncie, IN 43704, USA.
Title: Nurses' perceptions of their self-confidence and the benefits and risks of family presence during resuscitation.
Journal: Am J Crit Care. 2008 Mar;17(2):101-11; quiz 112.

Dava Brown
Author(s): K Renee Twibell, Paula Hofstetter, Debra Siela, Dava Brown, Holly M Jones
Title: A Comparative Study of Blood Sampling From Venipuncture and Short Peripheral Catheters in Pediatric Inpatients
Journal: J Infus Nurs. 2019 Sep/Oct;42(5):237-247. doi: 10.1097/NAN.0000000000000338.

Author(s): Dava Brown
Title: Local anesthesia for vein cannulation: a comparison of two solutions
Journal: J Infus Nurs. 2004 Mar-Apr;27(2):85-8. doi: 10.1097/00129804-200403000-00004.

Stacey Cadogan
Author(s): Stacey Cadogan, Sharon Miller
Title: Aspergillus pneumonia in adult patients with acute leukemia
Journal: Clin J Oncol Nurs. 2014 Apr;18(2):243-6. doi: 10.1188/14.CJON.243-246.

Gena Coers
Author(s): K. Renee Twibell, Lori Delaney, Debra Siela, Gena Coers, Christine Davis, Caitlin Drown, Kelly Kring, Jessica Duncan, James A. Jones
Title: Tailoring Fall Prevention Videos for Medical-Surgical Inpatients: A Randomized Controlled Trial.
Journal: MEDSURG Nursing. May/Jun2023, Vol. 32 Issue 3, p170-178

Author(s): K Renee Twibell, Debra Siela, Lori Delaney, Patricia Avila, Allison M Spradlin, Gena Coers
Title: Perspectives of Inpatients With Cancer on Engagement in Fall Prevention
Journal: Oncol Nurs Forum. 2020 Jul 1;47(4):457-468. doi: 10.1188/20.ONF.457-468.

Author(s): Twibell RS, Siela D, SSproat T, Coers G.
Renee Samples Twibell is an associate professor, School of Nursing, Ball State University, and a nurse researcher, Indiana University Health Ball Memorial Hospital, Muncie, Indiana. Debra Siela is an associate professor, School of Nursing, Ball State University. Terrie Sproat is a case manager and Gena Coers is a direct care nurse in perioperative services, Indiana University Health Ball Memorial Hospital.
Title: Perceptions Related to Falls and Fall Prevention Among Hospitalized Adults.
Journal: Am J Crit Care. 2015 Sep;24(5):e78-85. doi: 10.4037/ajcc2015375.

Shannon Craig
Author(s): Renee Samples Twibell, Shannon Craig, Debra Siela, Sherry Simmonds, Cynthia Thomas
Title: Being there: inpatients' perceptions of family presence during resuscitation and invasive cardiac procedures
Journal: Am J Crit Care. 2015 Nov;24(6):e108-15. doi: 10.4037/ajcc2015470.

Christine Davis
Author(s): K. Renee Twibell, Lori Delaney, Debra Siela, Gena Coers, Christine Davis, Caitlin Drown, Kelly Kring, Jessica Duncan, James A. Jones
Title: Tailoring Fall Prevention Videos for Medical-Surgical Inpatients: A Randomized Controlled Trial.
Journal: MEDSURG Nursing. May/Jun2023, Vol. 32 Issue 3, p170-178

Author(s): Twibell R, St. Pierre J, Johnson D, Barton D, Davis C, Kidd M, Rook G.
Ball State University, Muncie IN; IU Health Ball Memorial Hospital, Muncie IN.
Title: Tripping over the welcome mat: Why new nurses don't stay and what the evidence says we can do about it.
Journal: American Nurse. 2012 Jun;7(6) (3p.)

Lori Delaney
Author(s): K. Renee Twibell, Lori Delaney, Debra Siela, Gena Coers, Christine Davis, Caitlin Drown, Kelly Kring, Jessica Duncan, James A. Jones
Title: Tailoring Fall Prevention Videos for Medical-Surgical Inpatients: A Randomized Controlled Trial.
Journal: MEDSURG Nursing. May/Jun2023, Vol. 32 Issue 3, p170-178

Author(s): K Renee Twibell, Debra Siela,Lori Delaney, Patricia Avila, Allison M Spradlin, Gena Coers
Title: Perspectives of Inpatients With Cancer on Engagement in Fall Prevention
Journal: Oncol Nurs Forum. 2020 Jul 1;47(4):457-468. doi: 10.1188/20.ONF.457-468.

Caitlin Drown
Author(s): K. Renee Twibell, Lori Delaney, Debra Siela, Gena Coers, Christine Davis, Caitlin Drown, Kelly Kring, Jessica Duncan, James A. Jones
Title: Tailoring Fall Prevention Videos for Medical-Surgical Inpatients: A Randomized Controlled Trial.
Journal: MEDSURG Nursing. May/Jun2023, Vol. 32 Issue 3, p170-178

Jessica Duncan
Author(s): K. Renee Twibell, Lori Delaney, Debra Siela, Gena Coers, Christine Davis, Caitlin Drown, Kelly Kring, Jessica Duncan, James A. Jones
Title: Tailoring Fall Prevention Videos for Medical-Surgical Inpatients: A Randomized Controlled Trial.
Journal: MEDSURG Nursing. May/Jun2023, Vol. 32 Issue 3, p170-178

Author(s): Renee Twibell, Alexis Neal, Carla Cox, Diana Harris, Karrie Osborne, Jessica Duncan, Nadia Paul.
Title: Puzzling over family presence - Word search at the bedside
Journal: American Nurse 2012 Jul, 7(7): 4p.

Timothy B. Gant
Author(s): Gregory M Taylor, Robert S Avera, Christian C Strachan, Christian M Briggs, Jason P Medler, Carl M Pafford, Timothy B Gant
Title: Severe methemoglobinemia secondary to isobutyl nitrite toxicity: the case of the 'Gold Rush'
Journal: Oxf Med Case Reports. 2021 Feb; 2021(2): omaa136. Published online 2021 Feb 15. doi: 10.1093/omcr/omaa136 >

Rachel Harbison
Author(s): Carmen R Davis, Alyson Keen, Lauren Compton, Tiffany Rader,Rachel Harbison, Renee Twibell
Title:
Alcohol Withdrawal Assessment Tool (AWAT) Reliability and Validity: Implications for Nurses Caring for Inpatients With Mental Health Disorders
Journal: J Am Psychiatr Nurses Assoc, 2024 Jul-Aug;30(4):757-764. doi: 10.1177/10783903231183910. Epub 2023 Jun 30.

Diana Harris
Author(s): Renee Twibell, Alexis Neal, Carla Cox, Diana Harris, Karrie Osborne, Jessica Duncan, Nadia Paul.
Title: Puzzling over family presence - Word search at the bedside
Journal: American Nurse 2012 Jul, 7(7): 4p.

Author(s): Neal A, Twibell R, Osborne KE, Harris D.
Title: Providing family-friendly care -- even when stress is high and time is short
Journal: American Nurse Today. 2010 Nov;5(11):9-12.

Holly M. Jones
Authors: Kalyn M Renbarger, Elizabeth McIntire, Renee Twibell, Allyson Broadstreet, Jean Marie Place, Kristin E Trainor,Holly Jones, Sindee Fry
Title: Descriptions of Maternal Mortality From Nurses Who Practice in Perinatal Settings
Journal: Nurs Womens Health. 2022 Aug;26(4):288-298. doi: 10.1016/j.nwh.2022.05.003. Epub 2022 Jun 9.

Author(s): K Renee Twibell, Paula Hofstetter, Debra Siela, Dava Brown, Holly M Jones
Title: A Comparative Study of Blood Sampling From Venipuncture and Short Peripheral Catheters in Pediatric Inpatients
Journal: J Infus Nurs. 2019 Sep/Oct;42(5):237-247. doi: 10.1097/NAN.0000000000000338.

Michelle Kidd
Author(s): Michelle J. Kidd
Title: Sleep in the Critical Care Setting
Journal: Crit Care Nurse. 2023 Oct 1;43(5):63-66. doi: 10.4037/ccn2023592.

Michelle Kidd, Mary Beth Flynn Makic. "Chapter 26: Prevention of Catheter Associated Urinary Tract Infection." Evidence-Based Geriatric Nursing Protocols For Best Practice, edited by M. Boltz, E.A. Capezuti, D. Zwicker, T. Fulmer. Springer Publishing Co., March 27, 2020, 467 - 483 (available in the IUH Ball Medical Library).

Author(s): Debra Siela, RN, PhD, CCNS, ACNS-BC, CCRN-K, CNE, RRT, Michelle Kidd, RN, MS, ACNS-BC, CCRN-K
Title: Oxygen Requirements for Acutely and Critically Ill Patients
Journal: Crit Care Nurse. 2017 Aug;37(4):58-70. doi: 10.4037/ccn2017627.

Author(s): Michelle Kidd, MS, RN, ACNS-BC, CCRN; Kimberly Grove, BSN, RN, PCU; Melissa Kaiser, BSN, RN, PCU; Brandi Swoboda, RN, PCU; and Ann Taylor, BS, RN, PCU
Title: A new patient-acuity tool promotes equitable nurse patient assignments
Journal: American Nurse Today 2014; 9(13):4p.

Author(s): Twibell R, St. Pierre J, Johnson D, Barton D, Davis C, Kidd M, Rook G.
Ball State University, Muncie IN; IU Health Ball Memorial Hospital, Muncie IN.
Title: Tripping over the welcome mat: Why new nurses don't stay and what the evidence says we can do about it.
Journal: American Nurse. 2012 Jun;7(6) (3p.)

Jessica Kitterman
Author(s): Joyce Pittman, Terrie Beeson, Jessica Kitterman, Shelley Lancaster, Anita Shelly
Title:Medical device-related hospital-acquired pressure ulcers: development of an evidence-based position statement
Journal: J Wound Ostomy Continence Nurs. 2015 Mar-Apr;42(2):151-4; quiz E1-2. doi: 10.1097/WON.0000000000000113.

Kelly Kring
Author(s): K. Renee Twibell, Lori Delaney, Debra Siela, Gena Coers, Christine Davis, Caitlin Drown, Kelly Kring, Jessica Duncan, James A. Jones
Title: Tailoring Fall Prevention Videos for Medical-Surgical Inpatients: A Randomized Controlled Trial.
Journal: MEDSURG Nursing. May/Jun2023, Vol. 32 Issue 3, p170-178

Parker May
Author(s): Renee Twibell, PhD, RN, CNE; Austin May, BS, RN; and Parker May, BS, RN
Title: When the heart stops: Life-giving updates on cardiac arrest
Journal: American Nurse Today 2018; 13(2):5p.

Elizabeth McIntire
Author(s): Kalyn M Renbarger, Jean Marie Place, Renee Twibell, Kristin Trainor, Elizabeth McIntire
Title: Perspectives of Maternal Mortality Among Women Who Live in Indiana
Journal: J Obstet Gynecol Neonatal Nurs 2023 Jan;52(1):62-71. doi: 10.1016/j.jogn.2022.09.006. Epub 2022 Nov 8

Authors: Kalyn M Renbarger, Elizabeth McIntire, Renee Twibell, Allyson Broadstreet, Jean Marie Place, Kristin E Trainor, Holly Jones, Sindee Fry
Title: Descriptions of Maternal Mortality From Nurses Who Practice in Perinatal Settings
Journal: Nurs Womens Health. 2022 Aug;26(4):288-298. doi: 10.1016/j.nwh.2022.05.003. Epub 2022 Jun 9.

Alexis Neal
Author(s): Renee Samples Twibell, Debra Siela, Alexis Neal, Cheryl Riwitis, Heather Beane
Title: Family Presence During Resuscitation: Physicians' Perceptions of Risk, Benefit, and Self-Confidence
Journal: Dimens Crit Care Nurs. 2018 May/Jun;37(3):167-179. doi: 10.1097/DCC.0000000000000297.

Author(s): Renee Twibell, Debra Siela, Cheryl Riwitis, Alexis Neal, Nicole Waters
Title: A qualitative study of factors in nurses' and physicians' decision-making related to family presence during resuscitation
Journal: J Clin Nurs. 2018 Jan;27(1-2):e320-e334.doi: 10.1111/jocn.13948. Epub 2017 Sep 20.

Author(s): Twibell RS, Siela D, Riwitis C, Wheatley J, Riegle T, Bousman D, Cable S, Caudill P, Harrigan S, Hollars R, Johnson D, Neal A. School of Nursing, Ball State University, Ball Memorial Hospital, Muncie, IN 43704, USA. rtwibell@bsu.edu
Title: Nurses' perceptions of their self-confidence and the benefits and risks of family presence during resuscitation.
Journal: Am J Crit Care. 2008 Mar;17(2):101-11; quiz 112.

Amanda Olynger
Author(s): K. Renee Twibell, PhD, RN, CNE; Amber Petty, BSN, RN, CCRN; Amanda Olynger, BSN, RN, CCRN; Sheila Abebe, DNP, APRN, FNP-BC
Title: Families and post-intensive care syndrome
Journal: American Nurse Today. 2018 Apr;13(4): 6-11.

Karrie Osborne
Author(s): Neal A, Twibell R, Osborne KE, Harris D.
Title: Providing family-friendly care -- even when stress is high and time is short
Journal: American Nurse Today. 2010 Nov;5(11):9-12.

Nadia Paul
Author(s): Renee Twibell, Alexis Neal, Carla Cox, Diana Harris, Karrie Osborne, Jessica Duncan, Nadia Paul.
Title: Puzzling over family presence - Word search at the bedside
Journal: American Nurse 2012 Jul, 7(7): 4p.

Amber Petty
Author(s): Judy E Davidson, Neal Doran, Amber Petty, Daniel L Arellano, et al.
Title: Survey of Nurses' Experiences Applying The Joint Commission's Medication Management Titration Standards
Journal: Am J Crit Care 2021 Sep 1;30(5):365-374. doi: 10.4037/ajcc2021716.

Author(s): K. Renee Twibell, PhD, RN, CNE; Amber Petty, BSN, RN, CCRN; Amanda Olynger, BSN, RN, CCRN; Sheila Abebe, DNP, APRN, FNP-BC
Title: Families and post-intensive care syndrome
Journal: American Nurse Today. 2018 Apr;13(4): 6-11.

Tina Riegle
Author(s): Twibell RS, Siela D, Riwitis C, Wheatley J, Riegle T, Bousman D, Cable S, Caudill P, Harrigan S, Hollars R, Johnson D, Neal A. School of Nursing, Ball State University, Ball Memorial Hospital, Muncie, IN 43704, USA. rtwibell@bsu.edu
Title: Nurses' perceptions of their self-confidence and the benefits and risks of family presence during resuscitation.
Journal: Am J Crit Care. 2008 Mar;17(2):101-11; quiz 112.

Cheryl Riwitis
Author(s): Renee Twibell, Debra Siela, Cheryl Riwitis, Alexis Neal, Nicole Waters
Title: A qualitative study of factors in nurses' and physicians' decision-making related to family presence during resuscitation
Journal: J Clin Nurs. 2018 Jan;27(1-2):e320-e334.doi: 10.1111/jocn.13948. Epub 2017 Sep 20.

Gwendolyn Rook
Author(s): Twibell R, St. Pierre J, Johnson D, Barton D, Davis C, Kidd M, Rook G.
Ball State University, Muncie IN; IU Health Ball Memorial Hospital, Muncie IN.
Title: Tripping over the welcome mat: Why new nurses don't stay and what the evidence says we can do about it.
Journal: American Nurse. 2012 Jun;7(6) (3p.)

Author(s): Twibell R, Siela D, Rook G, Wrightsman E, Johnson D.
Title: Pick up some research to go!
Journal: American Nurse Today. 2010 Jul;5(7):25-7.

Debra Siela
Author(s): K. Renee Twibell, Lori Delaney, Debra Siela, Gena Coers, Christine Davis, Caitlin Drown, Kelly Kring, Jessica Duncan, James A. Jones
Title: Tailoring Fall Prevention Videos for Medical-Surgical Inpatients: A Randomized Controlled Trial.
Journal: MEDSURG Nursing. May/Jun2023, Vol. 32 Issue 3, p170-178

Author(s): K Renee Twibell, Debra Siela, Lori Delaney, Patricia Avila, Allison M Spradlin, Gena Coers
Title: Perspectives of Inpatients With Cancer on Engagement in Fall Prevention
Journal: Oncol Nurs Forum. 2020 Jul 1;47(4):457-468. doi: 10.1188/20.ONF.457-468.

Author(s): K Renee Twibell, Paula Hofstetter, Debra Siela, Dava Brown, Holly M Jones
Title: A Comparative Study of Blood Sampling From Venipuncture and Short Peripheral Catheters in Pediatric Inpatients
Journal: J Infus Nurs. 2019 Sep/Oct;42(5):237-247. doi: 10.1097/NAN.0000000000000338.

Author(s): Renee Samples Twibell, Debra Siela, Alexis Neal, Cheryl Riwitis, Heather Beane
Title: Family Presence During Resuscitation: Physicians' Perceptions of Risk, Benefit, and Self-Confidence
Journal: Dimens Crit Care Nurs. 2018 May/Jun;37(3):167-179. doi: 10.1097/DCC.0000000000000297.

Author(s): Renee Twibell, Debra Siela, Cheryl Riwitis, Alexis Neal, Nicole Waters
Title: A qualitative study of factors in nurses' and physicians' decision-making related to family presence during resuscitation
Journal: J Clin Nurs. 2018 Jan;27(1-2):e320-e334.doi: 10.1111/jocn.13948. Epub 2017 Sep 20.

Author(s): Debra Siela, RN, PhD, CCNS, ACNS-BC, CCRN-K, CNE, RRT, Michelle Kidd, RN, MS, ACNS-BC, CCRN-K
Title: Oxygen Requirements for Acutely and Critically Ill Patients
Journal: Crit Care Nurse. 2017 Aug;37(4):58-70. doi: 10.4037/ccn2017627.

Author(s): Renee Samples Twibell, Shannon Craig, Debra Siela, Sherry Simmonds, Cynthia Thomas
Title: Being there: inpatients' perceptions of family presence during resuscitation and invasive cardiac procedures
Journal: Am J Crit Care. 2015 Nov;24(6):e108-15. doi: 10.4037/ajcc2015470.

Author(s): Twibell RS, Siela D, SSproat T, Coers G.
Renee Samples Twibell is an associate professor, School of Nursing, Ball State University, and a nurse researcher, Indiana University Health Ball Memorial Hospital, Muncie, Indiana. Debra Siela is an associate professor, School of Nursing, Ball State University. Terrie Sproat is a case manager and Gena Coers is a direct care nurse in perioperative services, Indiana University Health Ball Memorial Hospital.
Title: Perceptions Related to Falls and Fall Prevention Among Hospitalized Adults.
Journal: Am J Crit Care. 2015 Sep;24(5):e78-85. doi: 10.4037/ajcc2015375.

Author(s): Debra Siela, PhD, RN, CCNS, ACNS-BC, CCRN-K, CNE, RRT; Renee Twibell, PhD, RN, CNE; Mahnaz Mahmoodi, MS, RN; and Sarah Mahboubi, AS, RN
Title: Close encounters at the bedside: Partnering among clinical nurses, students, and faculty
Journal: American Nurse Today. 2015 Jun;10(6): 8p.

Author(s): Siela D, Twibell R, Osborne K, Taylor AM.
Title: Find the best route to your career destination.
Journal: American Nurse Today. 2013 Jan;8(1):17-21.

Author(s): Twibell R, Siela D, Rook G, Wrightsman E, Johnson D.
Title: Pick up some research to go!
Journal: American Nurse Today. 2010 Jul;5(7):25-7.

Author(s): Twibell RS, Siela D, Riwitis C, Wheatley J, Riegle T, Bousman D, Cable S, Caudill P, Harrigan S, Hollars R, Johnson D, Neal A. School of Nursing, Ball State University, Ball Memorial Hospital, Muncie, IN 43704, USA. rtwibell@bsu.edu
Title: Nurses' perceptions of their self-confidence and the benefits and risks of family presence during resuscitation.
Journal: Am J Crit Care. 2008 Mar;17(2):101-11; quiz 112.

Author(s): Siela D, Twibell KR, Keller V.
Ball State University School of Nursing, 2000 University Ave, Muncie, IN 47306, USA. dsiela@bsu.edu
Title: The shortage of nurses and nursing faculty - what critical care nurses can do.
Journal: AACN Adv Crit Care. 2008 Jan-Mar;19(1):66-77.

Author(s): Twibell R, Siela D, Townsend T.
Title: Cultural issues in critical illness.
Book: CRITICAL CARE NURSING SYNERGY FOR OPTIMAL OUTCOMES. (pp.95-108). Boston, MA: Jones and Bartlett Publishers. 2007

Author(s): Anderson PS, Twibell R, Siela D.
Title: Delegating without doubts.
Journal: American Nurse Today. 2006 Nov;1(2):54-57.

Author(s): Twibell R, Siela D, Mahmoodi M.
School of Nursing, Ball State University, Critical Care Division, Ball Memorial Hospital, Muncie, Ind., USA.
Title: Subjective perceptions and physiological variables during weaning from mechanical ventilation.
Journal: Am J Crit Care. 2003 Mar;12(2):101-12.

Allison Spradlin
Author(s): K Renee Twibell, Debra Siela, Lori Delaney, Patricia Avila, Allison M Spradlin, Gena Coers
Title: Perspectives of Inpatients With Cancer on Engagement in Fall Prevention
Journal: Oncol Nurs Forum. 2020 Jul 1;47(4):457-468. doi: 10.1188/20.ONF.457-468.

Renee Twibell

Nicole Waters
Author(s): Renee Twibell, Debra Siela, Cheryl Riwitis, Alexis Neal, Nicole Waters
Title: A qualitative study of factors in nurses' and physicians' decision-making related to family presence during resuscitation
Journal: J Clin Nurs. 2018 Jan;27(1-2):e320-e334.doi: 10.1111/jocn.13948. Epub 2017 Sep 20.

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Poster Presentations

Author(s): Gena Coers, BS, RN; Renee Twibell, PhD, RN, CNE; Gwendolyn Rook, BS, RN; Kayla Anderson, BS, RN; Lynn Long, BS, RN
Title: Evidence-based Practice Resource Nurses: An Innovative Role for Enhancing Leadership Development

Author(s): Nancy Vanderbilt, MSN, FNP-C; Kristie Adams, BSN, RN, NPD-BC; Gena Coers, BS. RN; Renee Twibell, PhD, RN, CNS.
Title: Implementation and Evaluation of a Clinical Improvement Initiative to Enhance Interpersonal Relationships in Perioperative Services

Author(s): K. Renee Twibell, PhD, RN, CNE¹, Cynthia Davisson, MSN, RN-BC, LDCP, S. Renee Gregg, DNP, FNP-C.
Title: Fostering Evidence-Based Practice Competencies in Nurse Leaders: An Innovative Model